IUPAC Gold Book - Alphabetical index

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z all (6414 items)

α (alpha), β (beta)
α- (β-, γ-) ray spectrometer
α-addition (alpha-addition)
α-cleavage (alpha-cleavage)
α-decay (alpha-decay)
α-effect
α-elimination
α-expulsion in photochemistry
α-oxo carbenes
α-particle (alpha-particle)
'A' value
$A$ -factor^quantity
ab initio quantum mechanical methods
abatement in atmospheric chemistry
abeo-
abiological
abiotic
abiotic transformation
absolute activation analysis
absolute activity, $λ$ ^quantity
absolute configuration
absolute counting in radioanalytical chemistry
absolute electrode potential
absolute full energy peak efficiency
absolute lethal concentration ( $LC 100$ )^quantity
absolute lethal dose ( $LD 100$ )^quantity
absolute photopeak efficiency
absolute preconcentration in trace analysis
absorbance, $A$ ^quantity
absorbance matching in spectrochemical analysis
absorbed dose of a substance
absorbed dose, $D$ of radiation
absorbed electron coefficient in in situ microanalysis
absorbed electrons in in situ microanalysis
absorbed (spectral) photon flux density^quantity
absorbed (spectral) radiant power density^quantity
absorber
absorptance, $α$ ^quantity
absorption
absorption coefficient
absorption coefficient in biology
absorption cross-section, $σ$ ^quantity
absorption factor
absorption intensity
absorption line
absorption pathlength of a sample cell
absorption spectrum
absorptivity
abstraction
abstraction process in catalysis
abundance sensitivity in mass spectrometry
ac
accelerating voltage (high voltage, $V$ ) scan in mass spectrometry
acceleration, $a$ ^quantity
acceleration energy in in situ microanalysis
acceleration of free fall, $g$ ^quantity
accelerator in solvent extraction
acceptable daily intake ( $ADI$ )^quantity
acceptor number ( $AN$ )^quantity
accommodation coefficient
accretion in atmospheric chemistry
accuracy of a measuring instrument
accuracy of measurement
acenes
acetals
acetogenins
acetonides
acetylene black
acetylenes
acetylides
Acheson graphite
achiral
achirotopic
aci-nitro compounds
acid
acid anhydrides
acid deposition in atmospheric chemistry
acid rain in atmospheric chemistry
acid thioanhydrides
acid-labile sulfur
acidimetric titration
acidity
acidity constant
acidity function
acidosis
acid–base indicator
acid–base titration
actinic
actinic flux $S λ$ ^quantity
actinism
actinometer
actinometric factor^quantity
action spectrum
activated adsorption process
activated carbon
activated charcoal
activated complex
activation
activation analysis (nuclear)
activation cross-section
activation energy (Arrhenius activation energy)^quantity
activation in electrochemical corrosion
activation in radiochemistry
activation reaction
activator
active centre
active medium
active metal in electrochemical corrosion
active site in heterogeneous catalysis
active solid
active species
active state in electrochemical corrosion
active transport in biology
activity
activity, $A$ of a radioactive material^quantity
activity coefficient, $f$ , $γ$ ^quantity
activity (relative activity), $a$ ^quantity
acute toxicity
acyl anions
acyl carbenes
acyl cations
acyl groups
acyl halides
acyl radicals
acyl shift (1,2-, 1,3-, photochemical)
acyl species
acylals
acylium ions
acyloins
acyloxyl radicals
added hydrogen
addend
addition
addition reaction
additive
additive name
additivity of mass spectra
additivity principle
adduct
adduct ion in mass spectrometry
adhesional wetting
adiabatic
adiabatic electron transfer
adiabatic ionization in mass spectrometry
adiabatic lapse rate in atmospheric chemistry
adiabatic photoreaction
adiabatic transition-state theory
adiabatic treatments of reaction rates
adjacent re-entry model in polymer crystals
adjusted retention volume in chromatography
adjuvant
ADMR
adsorbate
adsorbent
adsorber
adsorption
adsorption capacity
adsorption chromatography
adsorption complex
adsorption current
adsorption hysteresis
adsorption indicator
adsorption isobar
adsorption isostere
adsorption isotherm in chromatography
adsorptive
advancement
advection in atmospheric chemistry
adverse effect
aeration in atmospheric chemistry
aerobe
aerobic
aerobic conditions
aerogel
aeromete in atmospheric chemistry
aerometric measurement in atmospheric chemistry
aerosol
aerosol hydrolysis
affine chain behaviour
affinity chromatography
affinity of reaction, $A$ ^quantity
after mass analysis in mass spectrometry
ageing of precipitate
agglomerate in catalysis
agglomerate in polymer science
agglomeration (except in polymer science)
agglomeration in polymer science
agglutination
aggregate in catalysis
aggregate in polymer science
aggregation (except in polymer science)
aggregation in polymer science
aging (ageing) of a polymer
aglycon (aglycone)
agonist
agostic
agostic interaction
agranular carbon
air contaminant in atmospheric chemistry
air mass in atmospheric chemistry
air monitoring station in atmospheric chemistry
air pollutant
air pollution
air pollution index (air quality index)
air pollution survey in atmospheric chemistry
air quality characteristic in atmospheric chemistry
air resource management in atmospheric chemistry
air sampling network in atmospheric chemistry
air-lift bioreactor
Aitken particles
albedo
albumin
alcogel
alcoholates
alcohols
alcoholysis
aldaric acids
aldazines
aldehydes
aldimines
alditols
aldoketoses
aldonic acids
aldoses
aldoximes
alert levels in atmospheric chemistry
alicyclic compounds
aliphatic compounds
aliquot in analytical chemistry
alkalimetric titration
alkaloids
alkalosis
alkanes
alkanium ions
alkene photocycloaddition
alkene photodimerization
alkene photoisomerization
alkene photorearrangement
alkenes
alkoxides
alkoxyamines
alkyl groups
alkyl radicals
alkylenes
alkylidene groups
alkylideneamino carbenes
alkylideneaminoxyl radicals
alkylideneaminyl radicals
alkylidenes
alkylidynes
alkynes
allele
allenes
allo- in amino-acid nomenclature
allometric
allosteric enzymes
allostery
allotriomorphic transition
allotropes
allotropic transition
allylic groups
allylic intermediates
allylic substitution reaction
alternancy symmetry
alternant
alternating copolymer
alternating copolymerization
alternating current
alternating voltage
altocumulus cloud in atmospheric chemistry
altostratus cloud in atmospheric chemistry
AM 0 sunlight
AM 1 sunlight
amalgam lamp
ambident
ambient air in atmospheric chemistry
ambient air quality in atmospheric chemistry
ambo
Ames/salmonella test
amic acids
amide hydrazones
amide oximes
amides
amidines
amidium ions
amidrazones
aminals
amine imides
amine imines
amine oxides
amine ylides
amines
aminimides
aminium ions
aminiumyl radical ions
amino radicals
amino sugars
amino-acid residue in a polypeptide
aminonitrenes
aminooxyl radicals
aminoxides
aminoxyl radicals
aminyl oxides
aminyl radicals
aminylenes
aminylium ions
ammonium compounds
ammonium imines
ammonium ylides
ammoniumyl radical ions
amorphous carbon
amount concentration, $c$ ^quantity
amount fraction, $x$ ( $y$ for gaseous mixtures)^quantity
amount of substance, $n$ ^quantity
amount-of-substance concentration
amount-of-substance fraction, $x$
ampere^unit
amperometric detection method in electrochemical analysis
amphipathic
amphiphilic
amphiprotic (solvent)
ampholytes
ampholytic polymer
amphoteric
amplification reaction
amplitude of alternating current
amplitude of alternating voltage
anabolism
anaerobe
anaerobic
anaesthetic
analgesic
analogue metabolism
analogue to digital converter (pulse)
analyte
analytical function
analytical instrument
analytical intercomparison
analytical portion
analytical pyrolysis
analytical quality control
analytical radiochemistry
analytical sample
analytical solution
analytical solution calorimetry
analytical unit (analyser)
anation
anchimeric assistance
aneroid barometer
Anger camera
angle^quantity
angle of observation^quantity
angle of optical rotation, $α$ ^quantity
angle strain
ångström ^unit
angular distribution
angular frequency, $ω$ ^quantity
angular momentum, $L$ ^quantity
angular overlap model (AOM)
anhydrides
anhydro bases
anilides
anils
anion
anion exchange
anion exchanger
anion radical
anion-exchange polymer
anionic polymer
anionic polymerization
anionotropic rearrangement (or anionotropy)
anisometric
anisotropy
annelation
annihilation
annulation
annulenes
annulenylidenes
anode
anodic transfer coefficient
anomeric effect
anomers
ansa compounds
antagonism
antagonist
antarafacial
anthelmint(h)ic
anthocyanidins
anthocyanins
anti
anti-Compton γ-ray spectrometer
anti-Hammond effect
anti-Markownikoff addition
anti-Stokes shift
anti-Stokes type radiation (fluorescence)
anti-thixotropy
antiaromatic compounds
antiaromaticity (antithetical to aromaticity)
antibiotic
antibody
antibonding molecular orbital
anticholinergic
anticircular elution (anticircular development) in planar chromatography
anticlinal
anticlined structures in polymers
anticodon
anticyclone in atmospheric chemistry
antiferroelectric transition
antiferromagnetic transition
antigen
antihelminth
antimetabolite
antimony–xenon lamp (arc)
antimycotic
antiparticle
antiperiplanar
antipodes
antiprismo-
antiresistant
antiserum
antisymmetry principle
ap
apex
apex current
apex potential
aphicide
apical (basal, equatorial)
apicophilicity
apo- in carotenoid nomenclature
apoenzyme
apoprotein
apoptosis
apparent lifetime
apparent (quantity)
apparent viscosity of a liquid
appearance energy (appearance potential)
appearance potential
appearance temperature, $T app$ in electrothermal atomization
applied potential
aprotic (solvent)
aquagel
aquation
arachno-
Archibald's method
area of an electrode-solution interface
area of interface
area viscosity
areic
arene epoxides
arene oxides
arenes
arenium ions
arenols
arenonium ions
argon ion laser
arithmetic mean (average)
aromatic
aromatic photocycloaddition
aromaticity
arrester in atmospheric chemistry
Arrhenius $A$ factor^quantity
Arrhenius energy of activation^quantity
Arrhenius equation
arsanes
arsanylidenes
arsanylium ions
arsenides
arsine oxides
arsines
arsinic acids
arsinidenes
arsinous acids
arsonic acids
arsonium compounds
arsonous acids
arsoranes
artificial graphite
artificial neural networks
artificial radioactivity
aryl cations
aryl groups
arylene groups
aryne
ascending elution (ascending development) in planar chromatography
ash in atmospheric chemistry
ashing in analysis
aspirator
assay
assay kit
association
association reaction (associative combination) in mass spectrometry
associative desorption
associative ionization in mass spectrometry
associative surface reaction
asym-
asymmetric
asymmetric carbon atom
asymmetric centre
asymmetric destruction
asymmetric film
asymmetric induction
asymmetric membrane
asymmetric photochemistry
asymmetric synthesis
asymmetric transformation
asymmetry
asymmetry potential of a glass electrode
atactic macromolecule
atactic polymer
atmosphere^unit
atmosphere of the earth
atmospheric pressure ionization in mass spectrometry
atom
atom-atom polarizability
atom-bond polarizability
atomic charge
atomic fluorescence
atomic laser
atomic mass constant^constant
atomic mass $m a$ ^quantity
atomic mass unit
atomic number, $Z$ ^quantity
atomic orbital, $ψ$ , $φ$ , $χ$
atomic ring-sector
atomic spectral lines
atomic symbol
atomic units
atomic weight
atomization in analytical flame spectroscopy
atomization surface temperature, $T s$ in electrothermal atomization
atomize
atomizer in analytical flame spectroscopy
atom–molecule complex mechanism
atropisomers
attachment
attenuance, $D$ ^quantity
attenuance filter
attenuation
attenuation coefficient
atto^{SI unit prefix}
attractive potential-energy surface
attractive–mixed–repulsive (AMR) classification
attributable risk
aufbau principle
Auger effect
Auger electron
Auger electron spectroscopy
Auger electron yield
Auger yield
autacoid
auto-ionization in mass spectrometry
autocatalytic reaction
automation in analysis
automerization
autophobicity
autopoisoning in catalysis
autoprotolysis
autoprotolysis constant
autoradiograph
autoradiolysis
auxiliary electrode
auxochrome
auxotrophy
avalanche photodiode
average current density
average degree of polymerization
average life in nuclear chemistry
average rate of flow in polarography
Avogadro constant^constant
avoided crossing of potential-energy surfaces
Avrami equation
axial chirality
axial (equatorial)
axialite in polymer crystals
axis of chirality
axis of helicity
aza-di-π-methane rearrangement
azacarbenes
azamines
azanes
azenes
azides
azimines
azines
azinic acids
azlactones
azo compounds
azo imides
azo ylides
azomethine imides
azomethine oxides
azomethine ylides
azomethines
azonic acids
azoxy compounds
azylenes
β (beta)
β-cleavage in mass spectrometry
β-decay
β-particle
back donation
back electron transfer
back extraction
back scatter coefficient in in situ microanalysis
back scattered electrons (BSEs) in in situ microanalysis
back washing
backbone
backflush
background concentration (level) in atmospheric chemistry
background mass spectrum
background of a radiation measuring device
background radiation
backscatter
backscattering spectroscopy
Baeyer strain
baffle chamber in atmospheric chemistry
bag filter in atmospheric chemistry
baghouse in atmospheric chemistry
Bainite transition
baking in carbon chemistry
Baldwin's rules
band spectra
bandgap energy $E g$ ^quantity
bandpass filter
bar^unit
barbiturates
barn^unit
Barton reaction
basal
base
base electrolyte
base kind of quantity
base pairing
base peak in mass spectrometry
base quantity
base unit of measurement
baseline concentration in atmospheric chemistry
baseline error in spectrochemical analysis
baseline in chromatography
basicity
basicity function
basis function
basis set
batch in analytical chemistry
batch injection calorimetry
batch operation in analysis
batch reactor
Bates–Guggenheim convention
bathochromic shift (effect)
bead-rod model
bead-spring model
beam current in in situ microanalysis
beam diameter in in situ microanalysis
beam-gas experiments
becquerel^unit
bed volume in chromatography
Beer–Lambert law (or Beer–Lambert–Bouguer law)
before mass analysis in mass spectrometry
Bell–Evans–Polanyi principle
benchmark dose ( $BMD$ ) and lower effective dose ( $LED$ )^quantity
bending of energy bands
Bent's rule
benzenium ions
benzenonium ions
benzylic groups
benzylic intermediates
benzynes
Berry pseudorotation
betaines
betweenanenes
bias
bias error
biased linear pulse amplifier
bicycle rearrangement
bicycle-pedal (BP) mechanism
bifunctional catalysis
bilayer
bimodal distribution
bimodal network
bimodal polymer network
bimolecular
binder
binder coke
binder in chromatography
binding energy
binding site
Bingham flow
bioassay
bioavailability (general)
bioavailabilty in pharmacokinetics
biocatalyst
biochemical (biological) oxygen demand ( $BOD$ )^quantity
biochip
bioconjugate
bioconversion
biodegradable polymer
biodegradation
bioelectronics
bioisostere
biological effect monitoring
biological exposure index ( $BEI$ )^quantity
biological half life
biological monitoring
biological tolerance values for working materials (Biologische Arbeitsstoff Toleranz Werte (BAT))^quantity
bioluminescence
biomarker
biomass
biomimetic
biopolymers
bioreactor
biosensor
biosphere in atmospheric chemistry
biosynthesis
biotechnology
biotransformation
biphotonic excitation
biphotonic process
bipolarons
bipolymer
biradical
biradicaloid
bisecting conformation (eclipsing conformation)
bismuthanes
bismuthines
bisphenols
bivane in atmospheric chemistry
black film
blank value in analysis
blaze-angle in spectrochemical analysis
bleaching in photochemistry
block
block copolymer
block macromolecule
block polymer
blotting in biotechnology
blowdown in atmospheric chemistry
blue shift
boat
Bodenstein approximation
body burden
bohr^unit
Bohr magneton^constant
Bohr radius^constant
bolometer
Boltzmann constant^constant
bomb-digestion in spectrochemical analysis
bond
bond dissociation
bond energy in theoretical chemistry
bond energy (mean bond energy)
bond length
bond migration
bond number
bond opposition strain
bond orbital
bond order
bond order $p r s$
bond ring-sector
bond-dissociation energy, $D$ ^quantity
bond-dissociation energy (BDE) in theoretical chemistry
bond-energy-bond-order method
bonded phase in chromatography
bonding molecular orbital
bonding number
boranes
boranylidenes
borderline mechanism
borenes
borinic acids
Born–Oppenheimer (BO) approximation
boronic acids
borylenes
boson
bound fraction in radioanalytical chemistry
boundary layer in atmospheric chemistry
bowsprit (flagpole)
branch point in polymers
branch (side chain, pendant chain) in polymers
branch unit in polymers
branched chain in polymers
branched polymer in polymers
branching chain reaction
branching decay
branching fraction
branching index in polymers
branching plane
branching ratio
break of a foam
break of an emulsion
Bredt's rule
breeching in atmospheric chemistry
breeze in atmospheric chemistry
Bremsstrahlung
Brewster angle, $θ B$ ^quantity
bridge
bridge index
bridge solution in pH measurement
bridged carbocation
bridgehead
bridging ligand
brightness
brightness of a laser dye
bromohydrins
bromonium ions
Brooks and Taylor structure
Brownian motion
brush macromolecule
Brønsted acid
Brønsted base
Brønsted relation
bubble column
bubbler in atmospheric chemistry
buffer-addition technique in analytical flame spectroscopy
bulk concentration in electroanalysis
bulk mesophase
bulk rheology
bulk sample
bulk strain^quantity
Bunnett–Olsen equations
Bunsen burner
Bunte salts
burn-up
burn-up fraction
burning tension of an electrical arc
burning velocity, $v b$ of a flame front in flame emission and absorption spectrometry
bypass injector in gas chromatography
χ-parameter
C-terminal residue in a polypeptide
C. I. P. system
cadmium–helium laser
cage
cage compound
cage effect
Cahn–Ingold–Prelog system
calcination
calcined coke
calibration component
calibration curve
calibration function in analysis
calibration gas mixture in atmospheric chemistry
calibration in analysis
calibration material in analysis
calibration mixture in analysis
calibration sample in analysis
calixarenes
calorie^unit
calorimetric titration
calorimetry
candela^unit
canonical form
canonical rate constant
canonical variational transition-state theory (CVTST)
capacitance hygrometer
capacitance, $C$ of a plate capacitor^quantity
capillary column in chromatography
capillary condensation
captodative effect
capture
capture cross-section
capture γ-radiation
carbaboranes
carbamates
carbanion
carbena
carbene analogues
carbene metal complexes
carbene radical anions
carbene radical cations
carbenes
carbenium centre
carbenium ion
carbenoids
carbinolamines
carbinols
carbinyl cations
carbo-reduction
carbocation
carbocyclic compounds
carbodiimides
carbohydrates
carbon
carbon artifact
carbon black
carbon cenospheres
carbon cloth
carbon dioxide laser (CO₂ laser)
carbon electrode
carbon felt
carbon fibre
carbon fibre fabrics
carbon fibres type HM
carbon fibres type HT
carbon fibres type IM
carbon fibres type LM
carbon fibres type UHM
carbon loading of the packing material in liquid chromatography
carbon material
carbon mix
carbon whiskers
carbonaceous mesophase
carbonitriles
carbonium ion
carbonization
carbonyl compounds
carbonyl imides
carbonyl imines
carbonyl oxides
carbonyl ylides
carbon–carbon composite
carboranes
carboxamides
carboxamidines
carboxylic acids
carbylamines
carbyne metal complexes
carbynes
carbynium ions
carotenes
carotenoids
carrier
carrier atom in organic reaction mechanisms
carrier gas
carrier in radioanalytical chemistry
carrier protein
carrier-free
carry-over
carry-over effect
cascade impactor
catabolism
catabolite repression
catalase
catalymetric titration
catalysed rate of reaction, $ξ cat$
catalysis
catalysis law
catalyst
catalyst ageing
catalyst deactivation
catalyst decay
catalyst in solvent extraction
catalytic activity concentration, $b$
catalytic activity content, $z m$
catalytic activity fraction of an isozyme
catalytic activity, $z$ of an enzyme
catalytic coefficient
catalytic concentration
catalytic content
catalytic cracking
catalytic current
catalytic current, limiting
catalytic dehydrocyclization
catalytic domain of a polypeptide
catalytic fraction
catalytic graphitization
catalytic hydrocracking
catalytic hydrodesulfurization
catalytic hydrogenolysis
catalytic methanation
catalytic reforming
catalytic thermometric titration
cataphoresis
catecholamines
catena-
catenanes (catena compounds)
cathode
cathodic transfer coefficient, $α c$ ^quantity
cation
cation exchange
cation exchanger
cation radical
cation-exchange polymer
cationic polymer
cationic polymerization
cationotropic rearrangement
cationotropy
cavitands
cavity dumping in photochemistry
cDNA
ceiling value ( $CV$ )^quantity
ceilometer in atmospheric chemistry
cell constant of a conductivity cell
cell error in spectrochemical analysis
cell line
Celsius temperature, $t$ , $θ$ ^quantity
centi^{SI unit prefix}
central atom
centre of a Mossbauer spectrum
centre of chirality
centrifugal barrier
centrifugal (centripetal) acceleration, $a rot$ ^quantity
centrifugal flow
centrifugal force, $F rot$ ^quantity
centrifugal radius, $r$ ^quantity
cephalins (kephalins)
cephalosporins
cephams
cephems
ceramer
ceramic
ceramic filter
ceramic precursor
ceramic yield
ceramic-reinforced polymer
ceramization
Cerenkov detector
Cerenkov effect
Cerenkov radiation
chain axis of a polymer
chain branching
chain carrier
(chain) conformational repeating unit of a polymer
chain entanglement
chain fission yield
chain folding in polymer crystals
(chain) identity period of a polymer
chain in polymers
chain initiation
chain length, $δ$
chain polymerization
chain reaction
(chain) repeating distance
chain scission of a polymer
chain transfer
chain-ending step
chain-orientational disorder in polymer crystals
chain-propagating reaction
chain-termination reaction
chair, boat, twist
chair–chair interconversion
chalcones
chamber saturation in gas chromatography
change of a quantity
change ratio of a quantity
channel
channel black
channel photomultiplier tube
chaperon
char
characteristic group in organic nomenclature
characteristic in analytical chemistry
characteristic length in thin films
characteristic mass for integrated absorbance, $m 0$ in electrothermal atomization^quantity
characteristic mass for peak absorption, $m p$ in electrothermal atomization^quantity
characteristic mass, $m c$ in electrothermal atomization^quantity
characteristic potential
characteristic ratio in polymers
characteristic scale in thin films
characteristic X-radiation
characteristic X-ray emission
charcoal
charge
charge density, $ρ$ ^quantity
charge hopping
charge number, $z$ ^quantity
charge number in inorganic nomenclature
charge number $n$ , $ν e$ , $z$ of a cell reaction^quantity
charge population
charge recombination
charge separation
charge shift
charge transfer transition to solvent (CTTS)
charge-exchange ionization in mass spectrometry
charge-exchange reaction
charge-inversion mass spectrum
charge-permutation reaction
charge-stripping reaction
charge-transfer adsorption
charge-transfer complex
charge-transfer (CT) state
charge-transfer (CT) transition
charge-transfer device in radiation detection
charge-transfer reaction in mass spectrometry
charge-transfer step of an electrode reaction
charring
Chatt–Dewar–Duncanson model
chelate
chelating polymer
chelation
chelatometric titration
cheletropic reaction
chelotropic reaction
chemi-ionization in mass spectrometry
chemical actinometer
chemical activation
chemical adsorption
chemical amount
chemical amplification
chemical bond
chemical decomposition
chemical diffusion
chemical dosimeter
chemical element
chemical equilibrium
chemical flux, $φ$ ^quantity
chemical functionality
chemical induction (coupling)
chemical ionization in mass spectrometry
chemical isotope exchange
chemical laser
chemical measurement process (CMP)
chemical modification
chemical oxygen demand ( $COD$ )^quantity
chemical potential, $μ B$ ^quantity
chemical reaction
chemical reaction equation
chemical relaxation
chemical shift, $δ$ in NMR^quantity
chemical shift in photoelectron and Auger spectra
chemical species
chemical species of an element
chemical substance
chemical vapour generation in spectrochemical analysis
chemical yield
chemically bonded hybrid (material)
chemically induced dynamic electron polarization (CIDEP)
chemically induced dynamic nuclear polarization (CIDNP)
chemically initiated electron exchange luminescence (CIEEL)
chemiexcitation
chemiflux
chemiluminescence
chemiluminescence analyser
chemiluminescent methods of detection in analysis
chemisorption (chemical adsorption)
chemometrics
chemoselectivity (chemoselective)
chemospecificity
chemostat
chimney effect in atmospheric chemistry
chiral
chiral mobile phase
chiral selector
chiral stationary phase in liquid chromatography
chirality
chirality axis
chirality centre
chirality element
chirality plane
chirality sense
chiroptic/chiroptical
chirotopic
chloramines
chlorocarbons
chlorohydrins
chloronium ions
cholesteric phase
chromatogram
chromatograph (noun)
chromatograph (verb)
chromatographic detector
chromatography
chromophore
chromosome
chronic toxicity
CIDEP (Chemically Induced Dynamic Electron Polarization)
CIDNP (Chemically Induced Dynamic Nuclear Polarization)
CIEEL (Chemically Initiated Electron Exchange Luminescence)
cine-substitution
CIP priority
circular development
circular dichroism (CD)
circular elution
circular frequency^quantity
cis, trans
cis conformation in polymers
cis- in inorganic nomenclature
cis-fused
cis-trans isomers
cisoid conformation
cistactic polymer
class (a) metal ion
class (b) metal ion
class of helix in polymers
clathrates
clausius^unit
clay hybrid
clean surface
clean up in spectrochemical analysis
clearance, $Δ V Δ t$ ^quantity
clearance in toxicology
clearing point
clinal
CLOGP values
clone
closed film
closed shell molecular systems
closed system in spectrochemical analysis
closo-
cloud in atmospheric chemistry
cluster
cluster analysis
cluster ion in mass spectrometry
cmc^quantity
co-ions
co-oligomer
co-oligomerization
co-solvency in polymers
CO₂ laser
coacervation
coagulation
coagulation (flocculation) in colloid chemistry
coal tar pitch
coal-derived pitch coke
coalescence in colloid chemistry
coalification
cobalamines
codon
coefficient
coefficient of haze ( $COH$ ) in atmospheric chemistry^unit
coenzyme
coextraction
cofactors
coherence length, $ζ$ in thin films^quantity
coherent (derived) unit of measurement
coherent radiation
coherent scattering
coherent source in spectrochemistry
coherent structure
coherent system of units of measurement
coincidence circuit
coincidence resolving time
coke
coke breeze
coking
col (saddle point)
cold neutrons
collection
collection efficiency in atmospheric chemistry
collection gas flow system in spectrochemical analysis
collector in atmospheric chemistry
collector (scavenger)
colligation
collimation
collimator
collinear reaction
collision complex
collision cross-section, $σ$ ^quantity
collision density, $Z AA$ ^quantity
collision diameter, $d$ ^quantity
collision efficiency, $B c$ ^quantity
collision frequency, $z A A$ ^quantity
collision number
collision theory
collision-induced dissociation in mass spectrometry
collisional activation (collisionally activated dissociation) in mass spectrometry
collisional broadening of a spectral line
collisional excitation in mass spectrometry
colloid
colloid osmotic pressure (Donnan pressure)
colloidal
colloidal carbon
colloidal dispersion
colloidal electrolyte
colloidal gel
colloidal network
colloidal processing
colloidal suspension
colloidally stable
color scale
colorimeter
colour indicator
colourability
column chromatography
column in chromatography
column volume, $V c$ in chromatography
comb macromolecule
comb polymer
combination electrode
combined sample
combustion gas
commensurate–incommensurate transition
common black film
common-ion effect (on rates)
communities (consortia, syntrophic or synergistic associations)
compact layer in electrochemistry
comparative molecular field analysis (CoMFA)
comparator in radioanalytical chemistry
compartmental analysis
compatible polymer blend
compensation effect
compensation in catalysis
compensation in stereochemistry
competition
competitive binding assay
competitive inhibition of catalysis
complementary binding sites
complementary DNA (cDNA)
complete active space self-consistent field (CASSCF)
complete active space self-consistent field second-order perturbation theory (CASPT2)
complex
complex coacervation
complex mechanism
complex reaction
complex-mode reaction
complexometric titration
component
composite
composite mechanism
composite membrane
composite reaction
composite sample
composition of pure air in atmospheric chemistry
compositional heterogeneity of polymers
compressibility factor
compression factor, $Z$ ^quantity
comproportionation
Compton effect
Compton electron
Compton scattering
computational chemistry
computational photochemistry
computer-assisted drug design (CADD)
computer-assisted molecular design (CAMD)
computer-assisted molecular modeling (CAMM)
concave isotherm in chromatography
concentrated phase in polymer chemistry
concentration
concentration depolarization
concentration distribution ratio, $D c$ in chromatography
concentration factor in solvent extraction
concentration gradient, $grad C$
concentration in experimental surface (or surface concentration)
concentration overpotential
concentration thermometric technique in enthalpimetric analysis
concentration-cell corrosion
concentration-sensitive detector in chromatography
concerted process
concerted reaction
condensation in atmospheric chemistry
condensation nuclei (CN) in atmospheric chemistry
condensation polymerization (polycondensation)
condensation reaction
condensative chain polymerization
conditional (formal) potential
conditional rate constant of an electrode reaction
conditioning in solvent extraction
conductance, $G$
conducting polymer
conducting polymer composite
conduction band
conductivity, $γ$ , $σ$ ^quantity
confidence level
confidence limits (about the mean)
configuration (electronic)
configuration interaction (CI)
configuration (stereochemical)
configurational base unit in polymers
configurational disorder in polymers
configurational homosequence in polymers
configurational repeating unit in polymers
configurational sequence in polymers
configurational unit in polymers
confined atomizer
conformation
conformational analysis
conformational analysis in drug design
conformational disorder in polymers
(chain) conformational repeating unit of a polymer
conformational repeating unit of a polymer
conformer
congener
conglomerate
congruent transition
conical intersection
coning and quartering in analytical chemistry
conjugate acid–base pair
conjugate solutions
conjugated system (conjugation)
conjugation
conjugation in gene technology
conjugation labelling in radioanalytical chemistry
conjugative mechanism
conjunctive name
connectivity
connectivity in polymer chemistry
conrotatory
consecutive reactions
consecutive steps
conservation of orbital symmetry
consignment in analytical chemistry
consistency
consolute point
constituent
constitution
constitutional heterogeneity of polymers
constitutional homosequence
constitutional isomerism
constitutional repeating unit (CRU) in polymers
constitutional sequence in polymers
constitutional unit
constitutive enzymes
contact angle^quantity
contact corrosion
contact ion pair
contact potential difference (Volta potential difference)
contamination
content
continuity inversion in solvent extraction
continuous analyser
continuous bed packing in liquid chromatography
continuous flow
continuous flow enthalpimetry
continuous indication analyser
continuous measuring cell
continuous operation in analysis
continuous precipitation
continuous transition
continuous wave (CW) laser
continuous-flow cell in spectrochemical analysis
continuously curved chain in polymers
contour length in polymers
contributing structure
control material in analysis
control sample in analysis
controlled atmosphere in atmospheric chemistry
convection (as applied to air motion)
convenience sample
conventional transition-state theory
conventional true value
conversion cross-section
conversion electron
conversion spectrum
convex isotherm in chromatography
cooperative transition
cooperativity
coordinate covalence
coordinate link
coordination
coordination entity
coordination number
coordination polyhedron (polygon)
coordinatively saturated complex
coordinatively unsaturated complex
copolymer
copolymer micelle
copolymerization
copper vapour laser
coprecipitation
copy number in biotechnology
core atom in organic reaction mechanisms
coronands (coronates)
corrected emission spectrum
corrected excitation spectrum
corrected retention volume in gas chromatography
correlation analysis
correlation coefficient
correlation diagram
correlation energy
corrinoids (cobalamines, corphyrins, corrins, vitamin B12 compounds)
corrosion
corrosion cell
corrosion current
corrosion potential, $E cor$ ^quantity
corrosion rate
cosolvent
cosphere
cotectic
coulomb^unit
coulomb integral, $H rr$ ^quantity
Coulomb repulsion
coulometric detection method in electrochemical analysis
coulometric titration
coumarins
count
counter tube
counter-current flow
counter-ions
counting efficiency
counting loss
counting rate
coupled cluster (CC) method
coupled (indicator) reaction in analysis
coupled simultaneous techniques in analysis
coupling
coupling constant (spin-spin), $J$ ^quantity
covalent bond
covalent network
Cox–Yates equation
cracking
crazing
cream
cream volume
creaming
creep
cresols
critical concentration
critical embryo
critical energy (threshold energy)
critical excitation energy, $E q$ in in situ microanalysis^quantity
critical ion-concentration in an ionomer
critical micelle concentration (cmc)^quantity
critical point
critical pressure, $p c$ ^quantity
critical quenching radius, $r 0$
critical solution composition
critical solution point
critical solution temperature
critical study
critical temperature, $T c$ ^quantity
critical thickness of a film
cross reaction
cross-conjugation
cross-flow filtration in biotechnology
cross-over concentration, $c *$
crossed electric and magnetic fields in mass spectrometry
crossed molecular beams
crossing over in biotechnology
crosslink
crosslink density
crosslinking
crosslinking site
crowding in solvent extraction
crown
crown conformation
crud in solvent extraction
cryogenic
cryogenic sampling
cryptand
cryptate
crystal diffraction spectrometer
crystal field
crystal field splitting
crystal laser
crystal photochemistry
crystalline electrodes
crystalline polymer
crystallinity
crystallization
CT
cumulative double bonds
cumulative fission yield
cumulative sample
cumulenes
cumulonimbus cloud in atmospheric chemistry
cumulus cloud in atmospheric chemistry
cupola
curie^unit
curing
current density^quantity
current density (relative local)
current distribution
current efficiency
current migration
current yield
Curtin–Hammett principle
curve-crossing model
cut off in aerosol sizes in atmospheric chemistry
cut-off filter
cut-on filter
CVD diamond
CW
cyanates
cyanides
cyanine dyes
cyanogenic
cyanohydrins
cybotactic region
cycles per second
cyclic acid anhydrides (cyclic anhydrides)
cyclitols
cyclization
cyclo-
cycloaddition
cycloalkanes
cycloalkyl groups
cyclodepsipeptides
cyclodextrins
cycloelimination
cyclohexadienyl cations
cyclone (collector) in atmospheric chemistry
cyclophanes
cyclopolymerization
cycloreversion
cyclosilazanes
cyclosiloxanes
cyclotron
cytochrome P450
cytochromes
Δ (delta), Λ (lambda)
d, l, dl
d, l, dl
3D-QSAR (three-dimensional quantitative structure–activity relationships)
dalton^unit
dark current^quantity
dark output^quantity
dark photochemistry (photochemistry without light)
dark reaction (darkness reaction)
dark resistance^quantity
Darlington phototransistor
DAS
data reduction
dative bond
Dauben–Salem–Turro rules
daughter ion in mass spectrometry
daughter product in radiochemistry
Davydov splitting (factor-group splitting)
day^unit
DCCA
de Mayo reaction
de-electronation
de-energization efficiency^quantity
deactivation
dead time correction in radioanalytical chemistry
dead time in radioanalytical chemistry
dead time of an analyser
dead-volume in chromatography
debye^unit
Debye–Hückel equation
deca^{SI unit prefix}
decadic absorbance, $A$ ^quantity
decay chain
decay constant^quantity
decay curve
decay rate in atmospheric chemistry
decay rate of a radioactive material^quantity
decay scheme in radioanalytical chemistry
decay time in heterogenous catalysis
deci^{SI unit prefix}
decibel^unit
decomposition
decontamination factor in liquid-liquid distribution
DEDMR
definitive method
deflection (for a precision balance)
deflocculation
deflocculation (peptization)
degeneracy^quantity
degenerate chain branching
degenerate chemical reaction
degenerate orbitals
degenerate rearrangement
degree Celsius^unit
degree Fahrenheit^unit
degree of activation
degree of arc^unit
degree of association of a micelle
degree of crystallinity of a polymer
degree of dissociation
degree of inhibition
degree of ionization
degree of (polarization) anisotropy^quantity
degree of polymerization
degree of reaction, $α$ ^quantity
degrees of cistacticity and transtacticity
degrees of freedom, $ν$
degrees of triad isotacticity, syndiotacticity, and heterotacticity
dehydroarenes
dehydrobenzenes
delayed coincidence
delayed coke
delayed coking process
delayed fluorescence
delayed luminescence
delayed neutrons
deliquescence
delocalization
delocalization energy (DE)
delocalization in theoretical organic chemistry
demister
denaturation of a macromolecule
denaturation of alcohol
dendrite
denitrification
densification
density, $ρ$ ^quantity
density inversion in solvent extraction
density of states, $N E$ , $r E$
denticity
denuder system (tube or assembly)
deodorizer in atmospheric chemistry
deoxyribonucleic acids (DNA)
depolarization of scattered light
depolarizer
depolymerization
deposition in atmospheric chemistry
deposition velocity in atmospheric chemistry
depsides
depsipeptides
depth of penetration of light
depth profile
depth resolution
deracemization
derivative potentiometric titration
derivative spectroscopy
derived coherent unit
derived kind of quantity
derived non-coherent unit
derived quantity
derived unit of measurement
descending elution/development in planar chromatography
deshielding
desiccant
desolvation in flame spectroscopy
desorption
desorption (by displacement)
desulfurization
desymmetrization
desymmetrization step
detachment
detailed balancing (principle of)
detection efficiency in nuclear analytical chemistry
detection limit
detection limit in analysis
detergent
detoxification
deuteriation
deuteride
deuterio
deuterium
deuteron
deviation, $d$
devolatilizer
dew point hygrometer (cooled surface condensation)
dew point in atmospheric chemistry
Dexter (electron exchange) excitation transfer
dextrans
dextrins
DFDMR
di-π-methane rearrangement
di-π-silane rearrangement
diabatic coupling
diabatic electron transfer
diabatic photoreaction
diacylamines
diads in polymers
diagram level in X-ray spectroscopy
diagram line in X-ray spectroscopy
dialysate
dialysis
dialysis residue
diamagnetic
diamidides
diamond
diamond by CVD
diamond-like carbon films
dianions
diastereoisomer (diastereoisomeric) excess
diastereoisomeric units in a polymer
diastereoisomerism
diastereoisomerization
diastereoisomers
diastereomeric ratio
diastereomers
diastereomorphism
diastereoselectivity
diastereotopic
diazanylidenes
diazenyl radicals
diazo compounds
diazoamino compounds
diazoates
diazonium salts
diazooxides
diazotates
dicarbenium ions
dichotomous sampler
dichroic filter
dichroic mirror
dichroism
dielectric constant
dielectric polarization, $P$ ^quantity
dienes
dienophile
difference absorption spectroscopy
differential capacitance^quantity
differential detector in chromatography
differential diffusion coefficient
differential molar energy of adsorption
differential molar interfacial energy
differential molar surface excess energy
differential scanning calorimetry (DSC)
differential thermal analysis (DTA)
differential viscosity
diffraction
diffraction analysis
diffuse layer in electrochemistry
diffused junction semiconductor detector
diffuser
diffusion
diffusion battery
diffusion coefficient, $D$ ^quantity
diffusion control
diffusion current constant in polarography
diffusion current (or diffusion-controlled current)
diffusion layer (concentration boundary layer)
diffusion layer thickness
diffusion potential
diffusion-controlled rate
diffusional transition
diffusionless transition
dihedral angle
diisotactic polymer
dilatancy
dilational (dilatational) transition
dilational viscosity
diluent gas
diluent in solvent extraction
dilute phase in polymer chemistry
dilute solution
diluter
dilution rate, $D$ in biotechnology^quantity
dimension of a quantity
dimensionless quantities
dimeric ion in mass spectrometry
dimerization
Dimroth–Reichardt $E T$ parameter
diode laser
diols
diosphenols
dioxin
dipolar aprotic solvent
dipolar bond
dipolar compounds
dipolar cycloaddition
dipolar ions
dipolar mechanism of energy transfer
dipole length
dipole moment
dipole moment per volume
dipole-induced dipole forces
dipole–dipole excitation transfer
dipole–dipole interaction
dipyrrins
dipyrromethenes
diradicaloid
diradicals
direct amplification
direct current
direct effect
direct fission yield
direct (radiochemical) isotope dilution analysis
direct reaction
direct thermometric method in enthalpimetric analysis
direct transfer gas flow system in spectrochemical analysis
direct-injection burner (for analytical flame spectroscopy)
direct-injection enthalpimetry
disaccharides
discomfort threshold in atmospheric chemistry
discontinuous analyser
discontinuous indication of an analyser
discontinuous measuring cell
discontinuous phase transition
discontinuous precipitation
discontinuous simultaneous techniques in analysis
discrete transport
discriminant analysis
discriminator
disintegration constant
disintegration energy, $Q$ ^quantity
disintegration rate of a radioactive material^quantity
disjoining pressure (for the attraction between two surfaces)
dismutation
dispenser
dispersion (for spectroscopic instruments)
dispersion forces
dispersion in atmospheric chemistry
displacement chromatography
displacive transition
disproportionation
disrotatory
disruptor
dissociation
dissociation energy, $E d$ , $D$ ^quantity
dissociative adsorption (dissociative chemisorption)
dissociative chemisorption
dissociative ionization in mass spectrometry
dissociative surface reaction
dissolution
dissymmetry in stereochemistry
dissymmetry of scattering
distonic radical cation
distribuend
distribution
distribution coefficient
distribution constant
distribution constant in chromatography
distribution function in polymers
distribution isotherm in chromatography
distribution ratio, $D$ in liquid-liquid distribution^quantity
disyndiotactic polymer
ditactic polymer
diterpenoids
dithioacetals
diurnal variation in atmospheric chemistry
dividing surface
DM-interference
DNA
DNA probe
Dobson unit in atmospheric chemistry^unit
docking studies
dodecahedro-
dolichols
Donnan emf (Donnan potential)
Donnan equilibrium
Donnan exclusion
Donnan pressure
donor number (DN)
dopant
doping in catalysis
doping in polymer chemistry
Doppler broadening of a spectral line
Dorn effect
dosage in atmospheric chemistry
dose
dose equivalent, $H$ ^quantity
dose in radioanalytical chemistry
dose of a substance
dose-response and dose-effect relationships
double escape peak
double-beam spectrometer (for luminescence spectroscopy)
double-focusing mass spectrograph
double-focusing mass spectrometer
double-layer
double-layer current
double-strand chain in polymers
double-strand copolymer
double-strand macromolecule
double-strand polymer
double-wavelength spectroscopy
doublet state
doubling time $t D$ in biotechnology^quantity
down-time in analysis
downconversion
downfield
downstream in membrane processes
downwash in atmospheric chemistry
drift
driving force (affinity) of a reaction, $A$ ^quantity
driving force (for electron transfer)
drop time in polarography
droplet in atmospheric chemistry
Drude–Nernst equation (for electrostriction)
drug
drug design
dry bulb temperature in atmospheric chemistry
drying agent
drying control chemical additive (DCCA)
dual fluorescence of systems or molecular species
dual substituent-parameter equation
dual-mode photochromism
dust collector in atmospheric chemistry
dust fall in atmospheric chemistry
dust in atmospheric chemistry
dye laser
dynamic field(s) mass spectrometer
dynamic interfacial tension
dynamic membrane formation
dynamic quenching
dynamic range of an analyser
dynamic reaction path (DRP)
dynamic surface tension
dynamic thermomechanometry
dynamic viscosity, $η$ ^quantity
dyne^unit
dyotropic rearrangement
dypnones
η (eta or hapto) in inorganic nomenclature
E, Z
E/Z photoisomerization
$E 2$ mass spectrum
early-downhill surface
EB curing
eclipsed (eclipsing)
eclipsing conformation
eclipsing strain
ectohormone
eddy
eddy dispersion (diffusion)
educt
effective cadmium cut-off energy in nuclear analytical chemistry
effective charge
effective chimney height (stack height)
effective half life
effective molarity (effective concentration)
effective theoretical plate number of a chromatographic column
effective thermal cross-section
effective thickness of diffusion layer
effectively infinite thickness in flame spectroscopy
effectiveness
effector
efficiency of a counter
efficiency, $η$ of a step^quantity
efficiency of atomization in analytical flame spectroscopy
efficiency of nebulization, $ɛ n$ in flame spectrometry^quantity
efficiency spectrum
efflorescence
effluent
effluent in chromatography
eicosanoids
eighteen-electron rule
einstein^unit
Einstein equation
El-Sayed rules
elastic collision
elastic scattering in reaction dynamics
elastic scattering in spectrochemistry
elastically active network chain
elastomer
electric capacitance
electric charge, $Q$ ^quantity
electric coherence length, $ξ E$ in thin films^quantity
electric conductance, $G$ ^quantity
electric conductivity
electric current, $I$ ^quantity
electric current density, $j$ ^quantity
electric dipole moment, $p$ ^quantity
electric displacement, $D$ ^quantity
electric field (strength), $E$ ^quantity
electric mobility, $u$ , $μ$ ^quantity
electric polarizability, $α$ ^quantity
electric potential, $V$ ^quantity
electric potential difference, $Δ V$ of a galvanic cell
electric resistance, $R$ ^quantity
electric resistivity
electric sector in mass spectrometry
electrical arc
electrical double-layer
electrical hygrometer
electrically conducting polymer
electrified interphase
electro-dialysis
electro-endosmosis
electro-osmosis
electro-osmotic hold-up time, $t eo$ in capillary electromigration^quantity
electro-osmotic mobility, $u$ or $μ eo$ in capillary electromigration^quantity
electro-osmotic pressure
electro-osmotic velocity
electro-osmotic volume flow
electroactive substance
electrocapillarity
electrocapillary equation
electrochemical detector in gas chromatography
electrochemical method of detection in analysis
electrochemical potential
electrochemiluminescence
electrochromic effect
electrocyclic reaction
electrode current density, $j$ ^quantity
electrode memory
electrode potential, $E$ ^quantity
electrode process
electrode reaction
electrode reaction rate constants
electrodecantation (or electrophoresis convection)
electrodeposition
electrofuge
electrogenerated chemiluminescence (ECL)
electrographite
electrokinetic potential, $ζ$ ^quantity
electroluminescence
electroluminescent polymer
electrolytic hygrometer
electromeric effect
electromigration
electromotive force, $E$ ^quantity
electron
electron acceptor
electron affinity, $E ea$
electron attachment
electron back-transfer
electron beam curing
electron capture
electron capture detector in gas chromatography
electron charge
electron configuration
electron correlation
electron density
electron density function
electron detachment
electron donor
electron energy in mass spectrometry
electron exchange excitation transfer
electron impact ionization in mass spectrometry
electron ionization in mass spectrometry
electron jump
electron kinetic energy
electron microscopy
electron paramagnetic resonance (EPR)
electron probe microanalysis (EPMA)
electron probe X-ray microanalysis (EPXMA)
electron rest mass^constant
electron spectroscopy for chemical analysis (ESCA)
electron stopping power in X-ray emission spectroscopy
electron transfer
electron transfer photosensitization
electron work function, $Φ$
electron-counting rules
electron-deficient bond
electron-deficient compounds
electron-donor-acceptor complex
electron-exchange polymer
electron-pair acceptor
electron-pair donor
electron-transfer catalysis
electronation
electronegativity
electroneutrality principle
electronic chemical potential
electronic configuration
electronic effect of substituents: symbols and signs
electronic energy migration (or hopping)
electronic stability
electronic state
electronic transition moment
electronically excited state
electronvolt^unit
electrophile (electrophilic)
electrophilicity
electrophoresis
electrophoresis convection
electrophoretic mobility, $μ$ ^quantity
electrophoretic velocity, $ν ep$
electrophotography
electrosmosis
electrostatic filter
electrostatic precipitator
electrostriction
electrothermal atomizer in spectrochemical analysis
electroviscous effects
element
element effect
element of chirality
elementary charge^constant
elementary entity
elementary particle in nuclear chemistry
elementary reaction
elimination
eluate
eluent
elute
elution
elution band in chromatography
elution chromatography
elution curve
elutriation
emanation thermal analysis
embryo
emission
emission anisotropy^quantity
emission control equipment in atmospheric chemistry
emission flux in atmospheric chemistry
emission in atmospheric chemistry
emission spectrum
emittance, $ɛ$ ^quantity
empirical formula
emulsifier
emulsion
enamines
enantioconvergence
enantioenriched
enantiomer
enantiomer excess (enantiomeric excess)
enantiomeric groups
enantiomeric purity
enantiomeric ratio
enantiomeric units in a polymer
enantiomerically enriched (enantioenriched)
enantiomerically pure (enantiopure)
enantiomerism
enantiomerization
enantiomorph
enantiomorphous structures in polymers
enantiopure
enantioselectivity
enantiotopic
enantiotropic mesophase
enantiotropic transition
encapsulation in catalysis
encounter
encounter complex
encounter control
encounter pair
encounter-controlled rate
end-group
end-point
end-to-end distance in polymers
end-to-end vector in polymers
endergonic (or endoergic) reaction
endo, exo, syn, anti
endocytosis
endoenzymes
endothermic reaction
ene reaction
energized species
energy, $E$ ^quantity
energy dispersion in emission spectrometry
energy dispersive detector
energy dispersive X-ray fluorescence analysis
energy flux density
energy gradient
energy hypersurface (synonymous with potential energy surface, PES)
energy migration
energy of a radiation
energy of activation
energy of activation of an electrode reaction
energy pooling
energy profile
energy resolution in radiochemistry
energy storage efficiency, $η$ ^quantity
energy threshold in radiochemistry
energy transfer in photochemistry
energy transfer plot in photochemistry
energy yield of luminescence
enforced concerted mechanism
enhanced phosphorescence analysis in luminescence spectroscopy
enhancement reaction in analytical chemistry
enhancer
enolates
enols
enophile
enoses
enrichment, isotopic
enrichment factor, $S$ in liquid-liquid distribution^quantity
ent
entanglement network
entatic state
entering group
enthalpimetric analysis
enthalpimetric flow injection analysis
enthalpimetric titration
enthalpimetry
enthalpogram
enthalpy, $H$ ^quantity
enthalpy of activation, $Δ ‡ H °$ ^quantity
enthalpy of immersion
enthalpy of wetting
entitic
entitic quantity
entrainment in atmospheric chemistry
entrainment in photochemistry
entrance channel
entropy, $S$ ^quantity
entropy of activation, $Δ ‡ S °$ ^quantity
entropy unit^unit
envelope conformation
environmental (or ambient) monitoring
environmental stress cracking
enzyme activator
enzyme activity
enzyme induction in general chemistry
enzyme induction in medicinal chemistry
enzyme inhibitor
enzyme repression
enzyme substrate electrode
enzyme thermistor
enzymes
enzymic decomposition
epi-phase
epicadmium neutrons
epigenetic
epihalohydrins
epimerization
epimers
episulfonium ions
epithermal neutrons
epitope
epoxides
epoxy compounds
equalization of electronegativity, principle of
equatorial
equilibration
equilibrium constant
equilibrium control
equilibrium dialysate
equilibrium distance in a molecule
equilibrium film
equilibrium geometry
equilibrium isotope effect
equilibrium reaction
equilibrium sedimentation
equilibrium solution
equivalence point
equivalence postulate in polymer chemistry
equivalent chain in polymers
equivalent diameter
equivalent entity
erg^unit
error of measurement
erythro, threo
erythro structures in a polymer
ESCA
escape depth (for surface analysis techniques)
Esin and Markov coefficient
esters
$E T$ -value
ethers
euatmotic reaction
eupeptide bond
eutectic reaction
evaluation function
evaporation
even-electron ion
evolved gas analysis (EGA)
evolved gas detection (EGD)
Ewens–Bassett number
exa^{SI unit prefix}
excess acidity
excess mass (at a solid/liquid interface)
excess Rayleigh ratio
excess volume (at a solid/liquid interface)
exchange current of an electrode reaction
exchange extraction
exchange integral
exchange labelling
exchange repulsion
exchange-inversion transition
excimer
excimer lamp
excimer laser
excimer-luminescence in luminescence quenching
excipient in toxicology
exciplex
exciplex-luminescence in luminescence quenching
excitation
excitation energy
excitation energy in in situ microanalysis
excitation level in X-ray spectroscopy
excitation spectrum
excitation transfer
excitation-emission spectrum
excited state
exciton
excluded volume of a macromolecule in polymers
excluded volume of a segment in polymers
exclusion chromatography
exergonic (exoergic) reaction
exfoliated graphite
exfoliation
exit channel
exitance
exo
exoenzymes
exon
exothermic reaction
expansion factor in polymers
expectation value
expected value
experimental perturbational calculation
explosivity limits (explosion limits)
exponential decay
exposure in medicinal chemistry
exposure in nuclear chemistry
exposure in photochemistry
expression in biotechnology
extended Hammett equation
extended Hückel MO method (EHMO)
extended X-ray absorption fine structure (EXAFS)
extended-chain crystal in polymers
extender
extensive quantity
extent of an interface (surface)
extent of reaction, $ξ$ ^quantity
external compensation
external heavy atom effect
external ion return
external ion-pair return
external photoelectric effect
external return
external standard in chromatography
external surface
exterplex
extinction
extinction coefficient
extra-column volume in chromatography
extract (noun)
extract (verb)
extractability in solvent extraction
extractant
extracting agent
extraction
extraction coefficient
extraction (equilibrium) constant
extraction factor, $D m$ ^quantity
extraction fractionation of polymers
extraction in process liquid-liquid distribution
extraction isotherm
extraction process in catalysis
extrapolated range in radiochemistry
extremophiles
extrusion transformation
f number
f-functional branch point
f-functional branch unit
fabric filter
fac-
factor
factor-group splitting
fall time
fallout in atmospheric chemistry
fanning in atmospheric chemistry
farad^unit
faradaic current
faradaic current density
faradaic demodulation current
faradaic rectification current
Faraday constant^constant
Faraday cup (or cylinder) collector
fast atom bombardment ionization
fast neutrons
fast-atom bombardment (FAB) mass spectroscopy
fatigue of a photochromic system
fatty acids
feed rate in catalysis
feed-back inhibition (end product inhibition) in biotechnology
feedback in analysis
feedback in kinetics
femto^{SI unit prefix}
fenestranes
Fenton reaction
fermentation
fermenter
fermi^unit
Fermi energy
Fermi level, $E F$
fermion
feromone
ferredoxin
ferrimagnetic transition
ferrocenophanes
ferroelastic transition
ferroelectric (antiferroelectric) transition
ferroelectric polymer
ferroic transition
ferromagnetic polymer
ferromagnetic transition
fertile in radioanalytical chemistry
fibrillar morphology
fibrous activated carbon
fibrous carbon
fibrous crystal in polymers
fiducial group
field desorption in mass spectrometry
field effect
field effect phototransistor
field ionization in mass spectrometry
field level
filamentous carbon
filler
filler coke
filling solution of a reference electrode
film
film badge in radioanalytical chemistry
film element
film tension
filter
filter of a radiation
filter spectrometer
filtration
fine structure constant, $α$ ^constant
first-order phase transition
first-pass effect
Fischer projection (Fischer–Tollens projection)
Fischer–Rosanoff convention (or Rosanoff convention)
Fischer–Tollens projection
fissile in radioanalytical chemistry
fission fragment ionization in mass spectrometry
fission fragments
fission neutrons
fission products
fission yield
fissionable
fixed ions
fixed neutral loss (gain) scan in mass spectrometry
fixed neutral loss (gain) spectrum in mass spectrometry
fixed precursor ion scan in mass spectrometry
fixed product ion scan in mass spectrometry
fixed product ion spectrum in mass spectrometry
flagpole
flame ionization detector in gas chromatography
flame photometric detector in gas chromatography
flame photometry
flame-in-tube atomizer in spectrochemical analysis
flammable limits
flash fluorimetry (phosphorimetry)
flash lamps
flash photolysis
flash point
flash vacuum pyrolysis (FVP)
flat band potential (at a semiconductor/solution interphase)
flat bands
flavins
flavonoids (isoflavonoids and neoflavonoids)
flavoproteins
flavylium salts
floating monolayer
floc
flocculation
floccule
Flory–Huggins theory
flotation
flow analysis
flow birefringence
flow enthalpimetry
flow injection
flow injection enthalpimetry
flow rate in chromatography
flow rate in flame emission and absorption spectrometry
flow rate of a quantity
flow rate of unburnt gas mixture in flame emission and absorption spectrometry
flow reactor
flow resistance parameter, $Φ$ in chromatography^quantity
flow-programmed chromatography
flue gas in atmospheric chemistry
flue gas scrubber in atmospheric chemistry
fluence, $F$ , $Ψ$ , $H 0$ ^quantity
fluence rate, $E o$ ^quantity
fluid coke
fluidity, $ϕ$ ^quantity
fluidized bed
fluoresceins
fluorescence
fluorescence error in spectrochemical analysis
fluorescence excitation of X-rays
fluorescence lifetime
fluorescence resonance energy transfer
fluorescence yield
fluorimeter
fluorocarbons
fluorogenic
fluorohydrins
fluorophore
flux depression
flux, $J X$ of a quantity
fluxional
fly ash in atmospheric chemistry
foam
foam fractionation
foaming agent
fog
fog horizon in atmospheric chemistry
folates
fold domain in polymer crystals
fold in polymer crystals
fold plane in polymer crystals
fold surface in polymer crystals
folded-chain crystal in polymers
foot^unit
forbidden line in X-ray spectroscopy
force, $F$ ^quantity
force constants
force-field calculation
foreign-gas broadening
formamidine disulfides
formation constant
formazans
Förster cycle
Förster excitation transfer (dipole–dipole excitation transfer)
Förster-resonance-energy transfer FRET
forward scattering
fossil fuel
fouling agent in catalysis
fouling in membrane processes
Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer
Fourier transform spectrometer
Fourier-transform spectroscopy
fractal agglomerate
fractal dimension, $d$
fraction
fraction collector in chromatography
fraction extracted, $E$ ^quantity
fractional change of a quantity
fractional selectivity in catalysis
fractionation of analytes
fractionation of polymers
fragment ion in mass spectrometry
fragmentation
fragmentation reaction in mass spectrometry
frame-shift mutation
Franck–Condon principle
Franck–Condon state
franklin^unit
free charge density on the interface
free electron laser
free energy
free radical
free rotation (hindered rotation, restricted rotation)
free spiro union
free-radical photosubstitution
free-running laser
freely draining
freely jointed chain in polymers
freely rotating chain in polymers
freezing
freezing out in atmospheric chemistry
frequency, $f$ , $ν$ ^quantity
frequency, $ν$ , $ω$ in photochemistry^quantity
frequency distribution
frequency doubling
frequency-domain fluorometry
FRET
friction coefficient^quantity
friction factor, $μ$ ^quantity
frictional coefficient, $f$ in polymer chemistry^quantity
fringed-micelle model in polymer crystals
front surface geometry in luminescence
frontal chromatography
frontier orbitals
fronting in chromatography
frost point hygrometer
froth flotation
Frumkin effect
fucolipid
fuel cycle (nuclear)
fuel element (nuclear)
fuel reprocessing (nuclear)
fugacity, $f$ , $p ˜$ ^quantity
fugacity coefficient, $ϕ$ ^quantity
fulgides
full energy peak
fullerenes
fulminates
fulvalenes
fulvenes
fume in atmospheric chemistry
fumes
fumigation in atmospheric chemistry
functional class name
functional group
functional parent
functional polymer
functionality, $f$ of a monomer^quantity
fungicide
furanocoumarins
furanoses
furnace black
furnace pyrolysis in spectrochemical analysis
furocoumarins
fusion in biotechnology
fusion name
FWHM (Full Width at Half Maximum)
γ-cascade
γ-quantum
γ-radiation
γ-ray spectrometer
$G$ value in nuclear chemistry^quantity
gain, $G$ of a photomultiplier^quantity
Galvani potential difference
galvanic corrosion
gas analysis installation in atmospheric chemistry
gas black (carbon black, channel black, furnace black)
gas chromatography (GC)
gas constant^constant
gas laser
gas sensing electrode
gas-filled phototube
gas-filled X-ray detector
gas-liquid chromatography
gas-phase acidity
gas-phase basicity
gas-phase-grown carbon fibres
gas-solid chromatography
gaseous diffusion separator in atmospheric chemistry
gated photochromism
gated photodetector
gauche
gauche conformation in polymers
gauche effect
gauss^unit
Gaussian band shape
Geiger counter
Geiger–Muller counter tube
gel
gel aging
gel fraction
gel microparticle
gel nanoparticle
gel permeation chromatography
gel point
gel temperature
gel time
gelation
gelation point
gelation temperature
gelation time
geminate ion pair
geminate pair
geminate recombination
gene amplification
gene (cistron)
gene library
gene manipulation
general acid catalysis
general acid–base catalysis
general base catalysis
general force field (gff)
generalized transition-state theory
generally labelled tracer
generation time, $t G$ in biotechnology^quantity
genetic algorithm
genetic code
genome
genomics
genotype
geometric attenuation
geometric isomerism
geometric (logarithmic) mean, $x ̄ g$
geometric surface (interface) area
geometrical equivalence in polymers
geometry (counting) in radioanalytical chemistry
geometry factor in radioanalytical chemistry
germylenes
germylidenes
gff
Gibbs adsorption
Gibbs dividing surface
Gibbs energy diagram
Gibbs energy (function), $G$ ^quantity
Gibbs energy of activation (standard free energy of activation), $Δ ‡ G o$ ^quantity
Gibbs energy of photoinduced electron transfer
Gibbs energy of repulsion
Gibbs energy profile
Gibbs film elasticity^quantity
Gibbs surface
giga^{SI unit prefix}
glass electrode error
glass laser
glass transition
glass-like carbon
glass-transition temperature
global analysis
globular-chain crystal in polymers
glove box
glycals
glycans
glycaric acids
glycerides
glycerophospholipid
glycitols
glyco-amino-acid
glycoconjugate
glycoglycerolipid
glycolipids
glycols
glyconic acids
glycopeptides (glycoproteins)
glycoproteins
glycosamines
glycosaminoglycan
glycoses
glycosides
glycosphingolipid
glycosyl group
glycosyl-amino-acid
glycosylamines
glycuronic acids
Gouy layer in electrochemistry
grab sampling
gradient
gradient elution in chromatography
gradient layer in chromatography
gradient packing
gradientless reactor in catalysis
gradual (sudden) potential-energy surface
graft copolymer
graft copolymerization
graft macromolecule
graft polymer
grafting in catalysis
grafting in polymer chemistry
gram^unit
Gram stain
granular carbon
graphene layer
graphite
graphite electrode
graphite fibres
graphite material
graphite whiskers
graphitic carbon
graphitizable carbon
graphitization
graphitization heat treatment
graphitized carbon
gravimetric method
gravitational constant^constant
gray^unit
green body
green coke
greenhouse effect in atmospheric chemistry
Grignard reagents
grist
grit in atmospheric chemistry
ground level concentration in atmospheric chemistry
ground level inversion in atmospheric chemistry
ground state
group
group electronegativity
group preconcentration in trace analysis
growth curve of activity
growth rate in biotechnology
Grunwald–Winstein equation
guest
Guinier plot
gustiness in atmospheric chemistry
h.e.e.t.p.
h.e.t.p.
Haber–Weiss reaction
haem
halato-telechelic polymer
halatopolymer
half life, $t 1 / 2$
half life of a radionuclide
half thickness in radiochemistry
half-chair
half-life, $τ 1/2$ , of a transient entity
half-life, $T 1/2$ , of a photochromic system
half-peak potential
half-wave potential
half-width of a band
halirenium ions
halochromism
haloforms
halohydrins
halonium ions
halophiles
hamiltonian operator $H ̂$
Hammett acidity function
Hammett equation (Hammett relation)
Hammond principle (Hammond postulate)
Hammond–Herkstroeter plot
handedness
Hansch analysis
Hansch constant
Hantzsch–Widman name
hapten
hapto
hard acid
hard amorphous carbon films
hard base
hard-segment phase domain
hard-sphere collision cross section
harmonic approximation
harmonic frequency generation
harmonic mean
harpoon mechanism
hartree
Hartree energy^constant
Hausdorff dimension
Haworth representation
hazard
haze horizon in atmospheric chemistry
haze in atmospheric chemistry
health surveillance
heat, $q$ , $Q$ ^quantity
heat capacity, $C$ ^quantity
heat capacity of activation, $Δ ‡ C p o$ ^quantity
heat flux, $J q$ ^quantity
heavy atom effect
heavy atom isotope effect
heavy water
hecto^{SI unit prefix}
height equivalent to a theoretical plate in chromatography (h.e.t.p.)
height equivalent to an effective theoretical plate in chromatography (h.e.e.t.p.)
helicenes
helicity
heliochromism
helion
helium dead-space in colloid and surface chemistry
helium ionization detector in gas chromatography
helium–cadmium laser
helium–neon laser
helix
helix residue in a polymer
helix sense
Helmholtz energy (function), $A$ ^quantity
hemes (heme derivatives)
hemiacetals
hemiaminals
hemiketals
hemileptic
hemins
hemochromes
hemodialysis
hemoglobins
Henderson–Hasselbalch equation
henry^unit
Henry's law
Herkstroeter plot
hertz^unit
Herz compounds
hetarenes
hetaryl groups
hetarynes
heteroalkenes
heteroarenes
heteroaryl groups
heteroarynes
heterobimetallic complex
heterochain polymer
heteroconjugation
heterocumulenes
heterocyclic compounds
heterocyclyl groups
heterodetic cyclic peptide
heterodisperse
heteroexcimer
heterogeneity in analytical chemistry
heterogeneous catalysis
heterogeneous diffusion rate constant in electrochemistry
heterogeneous membrane electrode
heterogeneous nucleation
heterogeneous polymer blend
heteroleptic
heterolysis (heterolytic)
heterolytic bond-dissociation energy
heterolytic dissociative adsorption
heteropolysaccharide (heteroglycan)
heterotactic polymer
heterotactic triads in polymers
heterotopic
heterotrophic (organisms)
heterovalent hyperconjugation
hexagonal graphite
hexahedro- in inorganic nomenclature
hexaprismo- in inorganic nomenclature
hidden return
high resolution energy loss spectroscopy (HRELS)
high-pressure graphitization
high-pressure mercury lamp (arc)
high-spin
higher-order transition
highly oriented pyrolytic graphite
Hildebrand parameter
hindered rotation
hipping
histones
Hofmann rule
hold-back carrier
hold-up volume in chromatography
hold-up volume (time), $V M$ , $t M$ in column chromatography
hole burning
hole transfer
holoenzyme
Holtsmark broadening of a spectral line
homo
homoaromatic
homochain polymer
homochiral
homoconjugation
homocyclic compounds
homodesmotic reaction
homodetic cyclic peptide
homogeneity in analytical chemistry
homogeneous catalysis
homogeneous membrane electrode
homogeneous nucleation
homogeneous nucleus
homogeneous polymer blend
homoleptic
homologous polymer blend
homolysis (homolytic)
homolytic dissociative adsorption
homomorphic
homopolymer
homopolymerization
homopolysaccharide (homoglycan)
homotopic
horizontal elution (horizontal development) in planar chromatography
host
host-vector system
hot atom
hot cell
hot ground state reaction
hot isostatic pressing
hot quartz lamp
hot state reaction
hour^unit
Hückel (4n + 2) rule
Hückel molecular orbital (HMO) theory
Huggins coefficient, $k H$ ^quantity
Huggins equation
hula-twist (HT) mechanism
humidity in atmospheric chemistry
humming gel
Hund rules
Hush model
HWHM (Half Width at Half Maximum)
hybrid material
hybrid orbital
hybrid polymer
hybridization
hybridoma
hydration
hydrazide hydrazones
hydrazide imides
hydrazides
hydrazidines
hydrazines
hydrazinylidenes
hydrazo compounds
hydrazones
hydrazonic acids
hydride
hydro
hydrocarbon cracking
hydrocarbons
hydrocarbyl groups
hydrocarbylene groups
hydrocarbylidene groups
hydrocarbylidyne groups
hydrocarbylsulfanyl nitrenes
hydrocracking unit
hydrodynamic volume in polymers
hydrodynamically equivalent sphere in polymers
hydrogel
hydrogen
hydrogen bond
hydrogen bond in theoretical organic chemistry
hydrogen gas electrode
hydrolases
hydrolysis
hydrolysis ratio, $r w$ ^quantity
hydrometeor in atmospheric chemistry
hydron
hydroperoxides
hydrophilic
hydrophilicity
hydrophobic interaction
hydrophobicity
hydropolysulfides
hydrosphere in atmospheric chemistry
hydrosulfides
hydroxamic acids
hydroximic acids
hydroxylamines
hygrometer
hygrometry (moisture analysis)
hyperchromic effect
hyperconjugation
hypercoordination
hyperfine coupling
hyperfine (interaction)
hyperpolarizability (of nth order)
hypersatellite in X-ray spectroscopy
hypervalency
hypho-
hypo-phase
hypochromic effect
hypsochromic shift
hysteresis
IC
icosahedro-
icosanoids
ICT
ICT emission
ideal, non-linear chromatography
ideal adsorbed state
ideal chromatography
ideal dilute solution
ideal gas
ideal mixture
ideally polarized (electrified) interphase
ideally unpolarized (electrified) interphase
(chain) identity period of a polymer
identity reaction
illuminance, $E$ , $E v$ ^quantity
image converter tube
image dissection tube
imaging (photoimaging)
imbalance
imbibition in colloid chemistry
imenes
imides
imidic acids
imidines
imidogens
imidonium ions
imidoyl carbenes
imidoyl nitrenes
imin
imine radical
imines
iminium compounds
imino acids
imino carbenes
iminooxy (iminoxy) radicals
iminoxyl radicals
iminyl carbenes
iminyl radicals
iminylium ions
immersional wetting
immiscibility
immiscible polymer blend
immission dose in atmospheric chemistry
immission flux in atmospheric chemistry
immission in atmospheric chemistry
immission rate in atmospheric chemistry
immobile adsorption
immobilization by adsorption in catalysis
immobilization by inclusion in catalysis
immobilization in biotechnology
immobilized enzyme
immobilized phase in chromatography
immune response
immunization
immunoassay
immunochemistry
immunogen
immunoglobulin (Ig)
immunoradiometric assay
immunosuppression
impact parameter, $b$ ^quantity
impact-modified polymer
impaction
impedance, $Z$ ^quantity
impingement
impinger
imprecision in analysis
impregnation in chromatography
impregnation in polymer chemistry
improved canonical variational transition-state theory (ICVTST)
impulsive reaction
in situ micro-X-ray diffraction (Kossel-technique)
in situ microanalysis
in vitro
in vivo
in-laboratory processing in analytical chemistry
in-out isomerism
in-situ composite formation
inaccuracy in analysis
inch^unit
incidence in medicinal chemistry
incinerator
inclusion compound (inclusion complex)
incoherent radiation
incoherent scattering
incoherent structure
incongruent reaction
increment (for bulk materials and large units)
indicated hydrogen
indicator electrode
indicator reaction
indicator (visual)
indifferent absorbing ion
indifferent electrolyte
indirect amplification
indirect reaction
individual gauge for localized orbitals (IGLO)
individual isotherm in surface chemistry
individual particle analysis
individual perception threshold in atmospheric chemistry (IPT)
induced radioactivity
induced reaction
inducer in enzyme catalysis
induction in enzyme catalysis
induction period
inductive effect
inductomeric effect
inductor
inelastic collision
inelastic scattering
inert
inert gas
inertial defect
inertial separator
infinite source thickness
information theory
infrared
inherent viscosity of a polymer
inhibition
inhibitor
inhibitory concentration ( $IC$ )^quantity
inhibitory dose ( $ID$ )^quantity
inhomogeneity error in spectrochemical analysis
initial energy in in situ microanalysis
initial (final) state correlations
initial rate method
initiation
initiator
injection temperature in chromatography
inner electric potential, $ϕ$ ^quantity
inner filter effect
inner Helmholtz plane (IHP)
inner layer (compact layer) in electrochemistry
inner orbital X-ray emission spectra
inner salts
inner-sphere electron transfer
inoculation
inorganic polymer
inorganic–organic polymer (IOP)
inositols
input rate in analysis
insert in biotechnology
insertion
insertion reaction
instability of Hartree–Fock solution
instability (with reference to instrumentation)
instantaneous current
instantaneous rate of flow in polarography
instantaneous (spot) sampling in atmospheric chemistry
instrumental activation analysis
instrumental dependability
instrumental indication (for a precision balance)
integral capacitance of an electrode^quantity
integral detector in chromatography
integrating sphere
intended crossing of potential-energy surfaces
intensity
intensity^quantity
intensity (relative to base peak) in mass spectrometry
intensive quantity
inter-junction molar mass^quantity
interaction distance
intercalation compounds
intercalation in polymer chemistry
intercalation reaction
interchange reaction
interchromophoric radiationless transition
interconal region
interconvertible enzyme
interface
interfacial adhesion
interfacial concentration, $c$ in electrochemistry
interfacial double-layer
interfacial layer
interfacial layer width, $σ S$ in thin films
interfacial region
interfacial tension
interference filter
interference in analysis
interfering lines
interfering substance in electroanalytical chemistry
interferometer
interferons
intermediate
intermediate neutrons
intermolecular
intermolecular radiationless transition
internal absorptance, $α i$ ^quantity
internal compensation
internal conversion
internal energy, $U$ ^quantity
internal filling solution of a glass electrode
internal reference electrode
internal return
internal standard in chromatography
internal surface
internal transmittance^quantity
internal valence force field (IVFF)
international calorie
International system of units
international unit
interparticle porosity, $ɛ$ in chromatography^quantity
interparticle volume of the column, $V 0$ in chromatography^quantity
interpenetrating polymer network (IPN)
interphase
interphase transition
intersection space
interstitial fraction in chromatography
interstitial velocity in chromatography
interstitial volume in gas chromatography
intersystem crossing
interval analysis
intervalence charge transfer
interzonal region
intimate ion pair
intra- in organic reaction mechanisms
intrachromophoric radiationless transition
intramolecular
intramolecular catalysis
intramolecular charge transfer, (ICT)
intramolecular isotope effect
intraphase transition
intrinsic activation energy, $E a,i$ ^quantity
intrinsic barrier
intrinsic detector efficiency
intrinsic full energy peak efficiency
intrinsic photopeak efficiency
intrinsic reaction coordinate
intrinsic viscosity of a polymer
intrinsically conducting polymer
intron
inverse isotope effect
inverse kinetic isotope effect
inverse micelle
inverse square law in radiation chemistry
inversion
inversion height in atmospheric chemistry
inversion point in phase transitions
inverted micelle
inverted region (for electron transfer)
iodohydrins
iodometric titration
iodonium ions
ion
ion collector in mass spectrometry
ion cyclotron resonance (ICR) mass spectrometer
ion energy loss spectra in mass spectrometry
ion exchange
ion exchanger
ion kinetic energy spectrum in mass spectrometry
ion laser
ion microscopy
ion pair
ion pair return
ion probe microanalysis (IPMA)
ion pumps
ion radical
ion scattering spectrometry (ISS)
ion source in mass spectrometry
ion trap mass spectrometer
ion-containing polymer
ion-exchange chromatography
ion-exchange isotherm
ion-exchange membrane
ion-exchange polymer
ion-free layer
ion-pair formation in mass spectrometry
ion-selective electrode cell
ion-selective electrode (ISE)
ion/molecule reaction in mass spectrometry
ion/neutral species exchange reaction in mass spectrometry
ion/neutral species reaction in mass spectrometry
ionene
ionic aggregates in an ionomer
ionic bond
ionic concentration
ionic conductivity^quantity
ionic copolymerization
ionic dissociation in mass spectrometry
ionic polymer
ionic polymerization
ionic spectral lines
ionic strength, $I$ ^quantity
ionic transport number, $t$ ^quantity
ionization
ionization buffer in flame spectroscopy
ionization by sputtering
ionization chamber
ionization cross-section
ionization efficiency
ionization efficiency curve in mass spectrometry
ionization energy, $E i$ ^quantity
ionization potential
ionizing collision in mass spectrometry
ionizing power
ionizing radiation
ionizing voltage
ionogenic groups
ionomer
ionomer cluster
ionomer molecule
ionomer multiplet
ionophore
IOP
IPN
ipso-attack
IPT
iridescent layers
iridoids
iron-sulfur cluster
iron-sulfur proteins
irradiance (at a point of a surface), $E$ ^quantity
irradiation
irregular macromolecule
irregular polymer
irreversible transition
ISC
isoabsorption point
isobar in atmospheric chemistry
isobaric mass-change determination
isobaric separation
isobars
isoclined structures in polymers
isoclinic point
isoconfertic separation
isoconjugate systems
isocoumarins
isocratic analysis in chromatography
isocyanates
isocyanides
isocyclic compounds
isodesmic reaction
isodiazenes
isoelectric
isoelectric point in electrophoresis
isoelectronic
isoemissive point
isoentropic
isoenzyme
isoequilibrium relationship
isoflavonoids
isogyric reaction
isoionic
isoionic point in electrophoresis
isokinetic line in atmospheric chemistry
isokinetic relationship
isokinetic sampling in atmospheric chemistry
isolampsic point
isolated double bonds
isolobal
isomer
isomer shift in Mössbauer spectroscopy
isomerases
isomeric
isomeric state in nuclear chemistry
isomeric transition in nuclear chemistry
isomerism
isomerization
isometric
isomorphic polymer blend
isomorphous structures in polymers
isonitriles
isonitroso compounds
isooptoacoustic point
isopeptide bond
isopotential point
isoprenes
isoprenoids
isopycnic
isopycnic separation
isorefractive
isosbestic point
isoselective relationship
isoselenocyanates
isostatic pressing
isosteric enthalpy of adsorption
isostilbic point
isostructural reaction
isotactic macromolecule
isotactic polymer
isotactic triads in polymers
isotherm in atmospheric chemistry
isothermal chromatography
isothiocyanates
isotones
isotope dilution
isotope dilution analysis
isotope effect
isotope exchange
isotope exchange analysis
isotope pattern in mass spectrometry
isotopes
isotopic abundance
isotopic carrier
isotopic enrichment
isotopic enrichment factor
isotopic fractionation factor
isotopic ion
isotopic labelling
isotopic molecular ion
isotopic scrambling
isotopic separation
isotopic tracer
isotopically deficient
isotopically enriched ions
isotopically labelled
isotopically modified
isotopically substituted
isotopically unmodified
isotopologue
isotopomer
isotropic
isotropic carbon
isotropic pitch-based carbon fibres
isoureas
isovalent hyperconjugation
isozyme
IVFF
j-value in atmospheric chemistry
Jablonski diagram
Jahn–Teller effect
Jahn–Teller transition
joule^unit
junction point
junction unit
junction-point density
κ (kappa) in inorganic nomenclature
Kamlet–Taft solvent parameters
Kaptein–Closs rules
Kasha rule
Kasha–Vavilov rule
katal^unit
Kekulé structure (for aromatic compounds)
kelvin^unit
ketals
ketazines
ketenes
ketenimines
ketides
ketimines
keto
keto carbenes
ketoaldonic acids
ketoaldoses
ketones
ketoses
ketoximes
ketyls
kilo^{SI unit prefix}
kilogram^unit
kind-of-property
kind-of-quantity
kinematic viscosity, $ν$ ^quantity
kinematics
kinetic activity factor
kinetic ambiguity
kinetic control of product composition
kinetic current
kinetic electrolyte effect (kinetic ionic-strength effect)
kinetic energy, $E k$ ^quantity
kinetic equivalence
kinetic isotope effect
kinetic method of analysis
kinetic resolution
kinetic synergist
kinetic theory of collisions
klado-
Koopmans' theorem
Koppel–Palm solvent parameters
Kosower Z-value
Kováts (retention) index^quantity
Krafft point
Kratky plot
krypton ion laser
Λ (lambda)
λ-transition (lambda-transition)
l, u
L
l
label
labelling
labile
laboratory sample
lachrymator
lactams
lactides
lactims
lactols
lactones
ladder chain
ladder macromolecule
ladder polymer
LADS
lag phase in biotechnology
lambda
Lambert law
lamellar crystal
lamp
lamp black
Landau–Zener model
Landolt reaction
Langmuir monolayer
Langmuir–Blodgett (LB) membrane
Langmuir–Hinshelwood mechanism
Langmuir–Rideal (Rideal–Eley) mechanism
Laporte rule
lapse rate in atmospheric chemistry
large particle in radiation scattering
lariat ethers
LAS
laser
laser beam ionization
laser dye
laser ionization in mass spectrometry
laser micro emission spectroscopy (LAMES)
laser micro mass spectrometry (LAMMS)
laser Raman microanalysis (LRMA)
laser-jet photochemical technique
lasing
late-downhill surface
latent image
latent period (latency) in medicinal chemistry
lateral order in a polymer
lateral resolution in in situ microanalysis
latex
lath crystal
lattice distortion
laws of distribution in precipitation
layer
layer equilibrium in chromatography
leader sequence in biotechnology
least motion, principle of
least-squares technique
leaving group
lecithins
lectins
LED
Leffler's assumption
left-to-right convention
length, $l$ ^quantity
lethal concentration
lethal dose
lethal synthesis
leuco bases
leuco compounds
leukotrienes
level
level width, $Γ$ ^quantity
levelling effect
Lewis acid
Lewis acidity
Lewis adduct
Lewis base
Lewis basicity
Lewis formula (electron dot or Lewis structure)
Lewis octet rule
LIDAR in atmospheric chemistry
lifetime of luminescence^quantity
lifetime, $τ$ ^quantity
ligand field
ligand field splitting
ligand to ligand charge transfer (LLCT) transition
ligand to metal charge transfer (LMCT) transition
ligands
ligases (synthetases)
ligate
light polarization
light scattering
light source
light-atom anomaly
light-emitting diode (LED)
lignans
lignins
limit of detection in analysis
limit test in toxicology
limiting adsorption current
limiting catalytic current
limiting condition of operation
limiting current
limiting differential diffusion coefficient
limiting diffusion current
limiting kinetic current
limiting mean
limiting migration current
limiting sedimentation coefficient
limiting viscosity number
line formula
line repetition groups
line width
line width in Mössbauer spectroscopy
line-of-centres model
line-shape analysis
linear absorption coefficient
linear attenuation coefficient
linear chain
linear chromatography
linear copolymer
linear (decadic) absorption coefficient in optical spectroscopy
linear (decadic) attenuation coefficient in optical spectroscopy
linear dichroism (LD)
linear dispersion
linear distribution isotherm in chromatography
linear electron accelerator
linear energy transfer
linear free-energy relation
linear Gibbs energy relation
linear macromolecule
linear polarizer
linear polymer
linear pulse amplifier
linear range
linear solvation energy relationships
linear strain, $ɛ$ , $e$ ^quantity
linearity of responsivity (of a radiation detector)
lineic
Lineweaver–Burk plot
linked scan in mass spectrometry
lipid film
lipids
lipophilic
lipophilicity
lipophobic
lipopolysaccharides
lipoproteins
liposome
Lippman's equation
liquid chromatography (LC)
liquid crystal
liquid crystal polymer
liquid excimer laser
liquid ion exchange
liquid ion laser
liquid junction
liquid laser
liquid membrane
liquid scintillation detector
liquid volume in gas chromatography
liquid-coated stationary phase (material) in liquid chromatography
liquid-crystal dendrimer
liquid-crystal polymer
liquid-crystal state
liquid-crystal transitions
liquid-crystalline phase
liquid-crystalline polymer
liquid-gel chromatography
liquid-liquid distribution (extraction) (partition)
liquid-liquid extraction
liquid-phase loading in chromatography
liquidus
lithometeor in atmospheric chemistry
lithosphere in atmospheric chemistry
litre^unit
live time
living copolymerization
living polymer
living polymerization
load (on a precision balance)
loading capacity in solvent extraction
local conformation of a polymer
local current density
local efficiency of atomization, $ɛ a$ in flame spectrometry^quantity
local flame temperature, $T 1$ in flame emission and absorption spectrometry
local fraction atomized, $χ a$ , $β a$ in flame emission and absorption spectrometry^quantity
local fraction desolvated, $χ s$ , $β s$ in flame emission and absorption spectrometry^quantity
local fraction volatilized, $χ v$ , $β v$ in flame emission and absorption spectrometry^quantity
localized adsorption
localized molecular orbitals (LMO)
localized-itinerant transition
lock-in state
log-normal distribution
logarithmic distribution coefficient in precipitation
logarithmic normal distribution of a macromolecular assembly
logarithmic viscosity number
logit
London forces
London–Eyring–Polanyi (LEP) method
London–Eyring–Polanyi–Sato (LEPS) method
lone (electron) pair
long chain
long spacing in polymer crystals
long-chain branch
long-lived collision complex
long-range intramolecular interaction in polymers
longitudinal order in a polymer
loose end
loose ion pair
Lorentz broadening of a spectral line
Lorentzian band shape
Lorenz–Mie theory
lot in analytical chemistry
low energy electron diffraction (LEED)
low pressure electrical discharge
low temperature UV–VIS absorption spectroscopy
low-pressure diamond
low-pressure mercury lamp (arc)
low-spin
low-spin state
lowest lethal concentration found^quantity
lowest observed adverse effect level (LOAEL)
lowest-observed-adverse-effect-level (LOAEL)^replaced
lowest-observed-effect-level (LOEL)
lumen ^unit
luminance^quantity
luminescence
luminescence anisotropy^quantity
luminescence quenching
luminescence spectrometer
luminous flux
luminous intensity $I v$ ^quantity
luminous quantities
lumiphore (luminophore)
LUMO
lux ^unit
lyases
lyate ion
lyonium ion
lyophilic
lyophilic sols
lyophobic
lyotropic mesophase
lysimeter
µ- (mu) in inorganic nomenclature
M
machine in analysis
macrocycle
macrolides
macrometeorology in atmospheric chemistry
macromolecular
macromolecular isomorphism
macromolecule (polymer molecule)
macromonomer
macromonomer molecule
macromonomer unit
macromonomeric unit (macromonomer unit)
macropore in catalysis
macroporous polymer
macroradical
macroscopic cross-section
macroscopic diffusion control
macroscopic film
macroscopic kinetics
magic acid
magic angle
magnetic circular dichroism (MCD)
magnetic coherence length, $ξ M$ in thin films^quantity
magnetic deflection in mass spectrometry
magnetic equivalence
magnetic field ( $B$ ) scan in mass spectrometry
magnetic field strength, $H$ ^quantity
magnetic flux, $Φ$ ^quantity
magnetic flux density, $B$ ^quantity
magnetic flux density in Mössbauer spectroscopy
magnetic induction^quantity
magnetic moment, $m$ , $μ$ ^quantity
magnetic resonance imaging (MRI)
magnetic susceptibility^quantity
magnetic susceptibility, $χ$ ^quantity
magnetic transition
magnetizability, $ξ$ ^quantity
magnetization transfer
magnetogyric ratio, $γ$ ^quantity
main chain (backbone) of a polymer
main-chain polymer liquid crystal
main-chain scission
mancude-ring systems
mancunide-ring systems
manipulator
manual in analysis
mapping in biotechnology
Marangoni effect
Marcus equation (for electron transfer)
Marcus inverted region (for electron transfer)
Marcus–Coltrin path
Marcus–Hush relationship
marker
Markownikoff rule
Mark–Houwink equation
martensitic transition
mass, $m$ ^quantity
mass analysis in mass spectrometry
mass balance in atmospheric chemistry
mass concentration, $γ$ , $ρ$ ^quantity
mass density
mass density gradient, $∇ ρ$ , $grad ρ$
mass distribution ratio^quantity
mass distribution ratio in chromatography
mass distribution ratio, $k MEKC$ in micellar electrokinetic chromatography^quantity
mass distribution ratio, $k MEEKC$ in micro-emulsion electrokinetic chromatography^quantity
mass excess, $Δ$ ^quantity
mass flow rate, $q m$ ^quantity
mass fractal dimension
mass fraction, $w$ ^quantity
mass number, $A$ ^quantity
mass peak in mass spectrometry
mass range in mass spectrometry
mass resolving power in mass spectrometry
mass spectrograph
mass spectrometer
mass spectrometer focusing system (deflection system)
mass spectrometer (operating on the linear accelerator principle)
mass spectrometric detector in gas chromatography
mass spectrometry
mass spectroscope
mass spectroscopy
mass spectrum
mass transfer coefficient in electrochemistry
mass transfer in biotechnology
mass (weight) of the stationary phase, $W s$ in chromatography
mass-average velocity in electrolytes
mass-distribution function
mass-flow sensitive detector in chromatography
mass-law effect
mass-to-charge ratio, $m z$ in mass spectrometry
mass-transfer-controlled electrolyte rate constant
massic
massive transition
matched cells in spectrochemical analysis
material safety data sheet (MSDS)
matrix effect
matrix in analysis
matrix isolation
Mattauch–Herzog geometry
maximum allowable concentration in atmospheric chemistry
maximum emission concentration in atmospheric chemistry
maximum hardness, principle of
maximum latent period
maximum loading
maximum permissible daily dose
maximum permissible level (MPL)
maximum storage life
maximum tolerable concentration (MTC)
maximum tolerable dose (MTD)
maximum tolerable exposure level (MTEL)
maximum tolerated dose (MTD)
MCD
McLafferty rearrangement in mass spectrometry
MCSCF method
mean activity of an electrolyte in solution
mean (average), $x ̄$
mean catalytic activity rate, $Δ z Δ t$
mean current density
mean exchange current density
mean free path, $λ$ ^quantity
mean interstitial velocity of the carrier gas in chromatography
mean life, $τ$
mean lifetime, $τ$ ^quantity
mean linear range in nuclear chemistry
mean mass range in nuclear chemistry
mean mass rate, $Δ m Δ t$
mean residence time of adsorbed molecules
mean substance rate, $Δ n Δ t$
mean volume rate, $Δ V Δ t$
measurable quantity
measurand
measured excitation spectrum
measured spectrum
measured value in analysis
measurement
measurement resolution in atmospheric trace component analysis
measurement result
measurement solution in analysis
measurement threshold of an analyser
mechanical entrapment
mechanical hygrometer
mechanical inhibitor in catalysis
mechanism of a reaction
mechanism-based inhibition
mechanization in analysis
Mechano-chemical reaction
median
median effective concentration ( $EC 50$ )^quantity
median effective dose ( $ED 50$ )^quantity
median lethal concentration ( $LC 50$ )^quantity
median lethal dose ( $LD 50$ )^quantity
median lethal time ( $TL 50$ )^quantity
median narcotic concentration ( $NC 50$ )^quantity
median narcotic dose ( $ND 50$ )^quantity
medium
medium effect
medium-pressure mercury arc
medium-pressure mercury lamp
mega^{SI unit prefix}
meiosis
Meisenheimer adduct
Meker burner
melting
melting point (corrected/uncorrected)
membrane
membrane emf
membrane in an ion-selective electrode
membrane potential
membrane sites in an ion-selective electrode
memory effect in atmospheric chemistry
mer in polymer chemistry
mer- in inorganic nomenclature
mercaptals
mercaptans
mercaptides
mercaptoles
mercury flow system in spectrochemical analysis
mercury–xenon arc
mercury–xenon lamp
mero
MERP
merry-go-round reactor (turntable reactor)
meso
meso structures in polymers
meso-compound
mesogen
mesogenic group
mesogenic monomer
mesogenic pitch
mesoionic compounds
mesolytic cleavage
mesomeric effect
mesomerism
mesomorphic phase
mesomorphic state
mesomorphic transition
mesopause in atmospheric chemistry
mesophase
mesophase pitch
mesophase pitch-based carbon fibres
mesophiles
mesopore in catalysis
mesoscale
mesosphere
messenger RNA (mRNA)
metabolic half-life (metabolic half-time)
metabolism
metabolite
metal distribution
metal to ligand charge transfer (MLCT) transition
metal to metal charge transfer (MMCT) transition
metallacycloalkanes
metallocenes
metalloenzyme
metallurgical coke
metal–carbene complexes
metal–carbyne complexes
metal–insulator transition
metal–nonmetal transition
metamagnetic transition
metastability of a phase
metastable
metastable film
metastable ion in mass spectrometry
metastable state in nuclear chemistry
metastable state in spectrochemistry
metatectoid reaction
metathesis
methanogens
method of isotopic perturbation
methylene
methylidyne
methylotrophic microorganisms
metre^unit
micellar catalysis
micellar mass
micellar solubilization
micellar weight
micelle
micelle charge
Michaelis constant, $K m$
Michaelis–Menten kinetics
Michaelis–Menten mechanism
micro^{SI unit prefix}
micro-network
microbial leaching
microcanonical rate constant
microcanonical variational transition-state theory (µVTST)
microcarrier in biotechnology
microclimatology
microdomain morphology
microelectrophoresis
microfiltration
microgel
microheterogeneity in biochemistry
micrometeorology
microphotometer
micropore filling in catalysis
micropore in catalysis
micropore volume in catalysis
microporous carbon
microscopic chemical event
microscopic cross-section, $σ>$ ^quantity
microscopic diffusion control (encounter control)
microscopic electrophoresis
microscopic film
microscopic kinetics
microscopic reversibility at equilibrium
microsome
microsyneresis
middle atmosphere
Mie scattering
migration
migration current
migration time, $t m$ in capillary electrophoresis^quantity
migration time of micelles, $t mc$ in micellar electrokinetic chromatography^quantity
migratory aptitude
migratory insertion
milli^{SI unit prefix}
milligram equivalent of readability of a precision balance
millimetre of mercury^unit
milling (grinding)
minimum consumption time, $t min$ in flame emission and absorption spectrometry^quantity
minimum density of states criterion
minimum lethal concentration ( $LC min$ )^quantity
minimum lethal dose ( $LD min$ )^quantity
minimum-energy reaction path (MERP)
minus
minute of arc^unit
miscibility
miscibility gap
miscible polymer blend
mist in atmospheric chemistry
mitochondria
mitosis
mixed ceramic
mixed control
mixed crystal (solid solution)
mixed energy release
mixed indicator
mixed labelled
mixed potential
mixing control
mixing height in atmospheric chemistry
mixing in analytical chemistry
mixing ratio in atmospheric chemistry
mixture
MLCT
mobile adsorption
mobile phase in chromatography
mobile-phase velocity, $u$ in chromatography
mobility, $μ$ ^quantity
mobility (general)^quantity
mobility in aerosol physics
Möbius aromaticity
mode
mode-locked laser
model network
moderation in nuclear chemistry
moderator
modified active solid in chromatography
modified Arrhenius equation
modified sample
modifier in solvent extraction
modulus of elasticity, $E$ ^quantity
Mohr amplification process in analysis
moiety
MOL file format
molal
molality, $m$ , $b$ ^quantity
molar
molar absorption coefficient, $ɛ$ ^quantity
molar absorptivity
molar activity in radiochemistry
molar average velocity in electrolytes
molar conductivity
molar decadic absorption coefficient^quantity
molar refraction, $R$ ^quantity
molar-mass exclusion limit in polymers
molarity
mole ^unit
mole fraction^quantity
molecular anion
molecular beams
molecular cation
molecular conformation of a polymer
molecular connectivity index
molecular design
molecular dynamics
molecular dynamics in drug design
molecular entity
molecular formula
molecular graph
molecular graph theory
molecular graphics
molecular ion in mass spectrometry
molecular kinetics
molecular laser
molecular mechanics calculation
molecular metal
molecular modeling
molecular nucleation in polymers
molecular orbital
molecular orientation
molecular rearrangement
molecular Rydberg state
molecular shape
molecular sieve effect
molecular spectra
molecular weight
molecular-weight exclusion limit in polymers
molecularity
molecule
molfile
molozonides
moment of a force, $M$ ^quantity
moment of inertia, $I$ , $J$ ^quantity
momentum, $p$ ^quantity
momentum spectrum
monitoring
mono-energetic radiation
monochromator
monoclonal antibodies (MAbs)
monodisperse medium
monodisperse polymer
monoisotopic mass spectrum
monolayer
monolayer capacity
monolith
monomer
monomer molecule
monomer unit
monomeric unit (monomer unit, mer)
monosaccharides
monotectic reaction
monotectoid reaction
monotectoid temperature
monoterpenes
monoterpenoids
monothioacetals
monotropic transition
Monte Carlo (MC), method of
Monte Carlo study
mordant
More O'Ferrall–Jencks diagram
Morin transition
morphology
morphology coarsening
morphotropic transition
Morse potential
Mössbauer effect
Mössbauer thickness in Mössbauer spectroscopy
most probable distribution (in macromolecular assemblies)
Mott transition
Mott–Hubbard transition
MPP-based carbon fibres
MRCI
mucopolysaccharides
Mulliken population analysis (MPA)
multi-centre bond
multi-centre reaction
multi-channel pulse height analyser
multi-strand chain in polymers
multi-strand macromolecule
multicoat morphology
multiconfiguration SCF method
multident
multienzyme
multienzyme complex
multienzyme polypeptide
multilayer
multilayer adsorption
multilayer aggregate in polymer crystals
multiphase copolymer
multiphoton absorption
multiphoton ionization in mass spectrometry
multiphoton process
multiple inclusion morphology
multiple ionization satellite in X-ray spectroscopy
multiple peak scanning in mass spectrometry
multiple scattering
multiple-pass cell in spectrochemical analysis
multiplex spectrometer
multiplicative name
multiplicity (spin multiplicity)
multiply labelled
multipole line in X-ray spectroscopy
multireference configuration interaction (MRCI)
multistage sampling
multivariate statistics
munchnones
muonium
mustard oils
mustards
mutagen
mutagenesis
mutarotation
mutation
mutation rate in biotechnology
mutual inductance, $M$ ^quantity
Myelin cylinders
n → π* state
n → π* transition
n → σ* transition
n-σ* delocalization (or n-σ* no bond resonance)
n-star macromolecule
n-strand chain
n-strand molecule
N-terminal residue in a polypeptide
nano^{SI unit prefix}
nanocomposite
nanodomain morphology
nanofiltration
nanogel
nanoscopic film
naphthenes
naphthenic acids
narcissistic reaction
natural atomic orbital (NAO)
natural bond orbital (NBO)
natural broadening of a spectral line
natural graphite
natural hybrid orbital (NHO)
natural isotopic abundance
natural lifetime^quantity
natural orbital
natural population analysis (NPA)
natural radiation
natural radioactivity
neat soap
necrosis
needle coke
negative adsorption
negative feedback
negative hyper-conjugation
negative ion in mass spectrometry
negaton
neighbouring group participation
nematic phase
nematic state
neodymium laser
neoflavonoids
neolignans
neper ^unit
nephelometry
Nernst's diffusion layer
net current
net electric charge, $z$ of a particle in electrophoresis
net in surface chemistry
net shaping
network
network defect
network in polymer chemistry
network polymer
network-chain molar mass, $M c$ ^quantity
neutral-density filter
neutralized gel
neutrino (electron neutrino)
neutron
neutron density
neutron multiplication
neutron number, $N$ ^quantity
neutron rest mass^constant
neutron temperature
neutrophilic organisms
Newman projection
newton ^unit
Newton black film
Newton diagram
Newtonian fluid
NHOMO
nido-
Nier–Johnson geometry
NIH shift
nimbostratus cloud in atmospheric chemistry
nitramines
nitrenes
nitrenium ions
nitrification
nitrile imides
nitrile imines
nitrile oxides
nitrile sulfides
nitrile ylides
nitriles
nitrilimines
nitrilium betaines
nitrilium ions
nitrimines
nitro compounds
nitrogen fixation
nitrogen laser
nitrogen mustards
nitrogen ylides
nitrolic acids
nitrones
nitronic acids
nitrosamides
nitrosamines
nitrosimines
nitroso compounds
nitrosolic acids
nitroxides
nitroxyl radicals
no carrier added
no observed adverse effect level (NOAEL)
no-bond resonance
no-load indication (for a precision balance)
no-observed-effect-level (NOEL)
nodal plane
noise
nominal linear flow, $F$ in chromatography^quantity
nominally labelled tracer
non-calorimetric thermophysical measurements
non-coherent source in spectrochemistry
non-crossing rule
non-crystalline electrodes
non-destructive activation analysis
non-diagram line in X-ray spectroscopy
non-dissociative chemisorption
non-draining
non-empirical quantum mechanical methods
non-equilibrium reaction
non-graphitic carbon
non-graphitizable carbon
non-ideal, linear chromatography
non-ideal, non-linear chromatography
non-ideal chromatography
non-isotopic labelling
non-Kekulé molecules
non-linear chromatography
non-linear distribution isotherm in chromatography
non-linear optical effect
non-linear optical polymer
non-linear optical techniques
non-linearity error in spectrochemical analysis
non-localized adsorption
non-polarized interphases
non-radiative decay
non-specific adsorption
non-uniform corrosion
non-uniform polymer
non-vertical energy transfer
nonadiabatic
nonadiabatic coupling
nonadiabatic electron transfer
nonadiabatic photoreaction
nonbonded interactions
nonbonding molecular orbital
nonclassical carbocation
nonclassical structure
nonselective detector
nonselective quantum counter
nonselectively labelled
nor-
normal
normal distribution
normal kinetic isotope effect
normal region (for electron transfer)
normal stress, $σ$ ^quantity
normal X-ray level
normal-phase chromatography
normalization
Norrish Type I photoreaction
Norrish Type II photoreaction
Norrish–Yang reaction
nth order phase transition
nuclear atom
nuclear chemistry
nuclear decay
nuclear disintegration
nuclear fission
nuclear fuel
nuclear fusion
nuclear fusion reaction
nuclear graphite
nuclear isomers
nuclear level
nuclear magneton^constant
nuclear particle
nuclear quadrupole moment (spectroscopic)
nuclear reactor
nuclear transformation
nuclear transition
nuclearity
nucleating agent
nucleation and growth
nucleation in colloid chemistry
nucleation of phase separation in polymer chemistry
nucleic acids
nucleofuge
nucleon
nucleon number
nucleophile (nucleophilic)
nucleophilic aromatic photosubstitution
nucleophilic catalysis
nucleophilicity
nucleoproteins
nucleosides
nucleotide bases
nucleotides
nucleus
nuclide
nuclidic mass
nuisance threshold in atmospheric chemistry
number concentration, $C$ , $n$ ^quantity
number content, $N B m$
number density, $n$ ^quantity
number flow rate, $q N$ ^quantity
number fraction
number of entities, $N$ ^quantity
number of moles^quantity
number of theoretical plates^quantity
number-distribution function
numerical value of a quantity
OBF
observation height, $h obs$ in flame emission and absorption spectrometry
observation pathlength, $l obs$ in flame emission and absorption spectrometry
observation space in flame emission and absorption spectrometry
observation volume, $V obs$ in flame emission and absorption spectrometry
observed rate coefficient^quantity
occlusion (molecular)
octahedro- in inorganic nomenclature
odd-electron ion
ODMR (Optically Detected Magnetic Resonance)
odour threshold in atmospheric chemistry
ohm ^unit
OIP
OLED
olefins
oligo
oligomer
oligomer molecule
oligomeric
oligomerization
oligonucleotides
oligopeptides
oligosaccharides
OMA
one-bond-flip (OBF)
one-colour indicator
one-photon photochromism
onion morphology
onium compounds
OPA
open atomizer
open dynamic system in spectrochemical analysis
open film
open hearth furnace in atmospheric chemistry
open static system in spectrochemical analysis
open-shell systems
open-tubular column in chromatography
operational pH cell
operational pH standard
operator gene
operon
OPO
opposing reactions
optical activity
optical antipodes
optical density
optical filter
optical isomers
optical multi-channel analyser (OMA)
optical parametric amplification (OPA)
optical parametric oscillator (OPO)
optical parametric processes
optical purity
optical resolution
optical rotation
optical rotatory power
optical spectroscopy
optical yield
optical-beam error in spectrochemical analysis
optically active polymer
optically labile
optoacoustic spectroscopy
orbital (atomic or molecular)
orbital energy
orbital steering
orbital symmetry
order of reaction, $n$ ^quantity
order parameter
order-disorder transition
ordered co-continuous double gyroid morphology
organelles
organic dye laser
organically modified silica
organically modified silicate
organically-modified ceramic
organic–inorganic polymer (OIP)
organo-
organoheteryl groups
organometallic compounds
organomodified ceramic
organyl groups
origin of replication (ori)
ortho acids
ortho amides
ortho esters
ortho- and peri-fused (polycyclic compounds)
ortho-fused (polycyclic compounds)
orthokinetic aggregation in colloids
osazones
oscillating reaction
oscillator strength, $f i j$
osmolality, $m$ ^quantity
osmolarity^quantity
osmotic coefficient, $ϕ$ ^quantity
osmotic concentration, $c$ ^quantity
osmotic pressure, $Π$ ^quantity
osones
osotriazoles
Ostwald ripening
out-isomer
out-of-plane bending coordinate in molecular geometry
outer electric potential, $ψ$ ^quantity
outer Helmholtz plane (OHP)
outer-sphere electron transfer
outgassing of a catalyst
output rate
overall activation energy
overlap integral, $S r s$
overpotential, $η$ ^quantity
oxa-di-π-methane rearrangement
oxenium ions
oxidant in atmospheric chemistry
oxidation
oxidation number
oxidation state
oxidation-reduction polymer
oxidation–reduction (redox) titration
oxidative addition
oxidative coupling
oxide network
oxidized species
oxidoreductases
oxime O-ethers
oximes
oxo acids
oxo carboxylic acids
oxo compounds
oxoacids
oxocarbons
oxonium ions
oxonium ylides
oxyacid (oxy-acid)
oxygen-flask combustion in spectrochemical analysis
oxylium ions
ozone hole
ozonides
π – π* state
π → π* transition
π → σ* transition
π-adduct
π-bond
π-complex
π-electron acceptor/donor group
P, M
packed column in chromatography
packing in column chromatography
paddlanes
pair attenuation coefficient in nuclear chemistry
pair correlation length, $ξ$ in thin films^quantity
pair production in nuclear chemistry
PAL
Pallmann effect
PAN-based carbon fibres
paraffin
parallel reactions
parallel-chain crystal in polymers
paramagnetic
parametric amplification
parametric processes
parent hydride
parent ion in mass spectrometry
Pariser–Parr–Pople (PPP) method
partial anodic (cathodic) current
partial charge exchange reaction
partial charge transfer reaction
partial decay constant in nuclear chemistry
partial digestion in spectrochemical analysis
partial isotherm (or individual isotherm) in surface chemistry
partial kinetic current in electrochemistry
partial least squares (PLS)
partial mass density, $ρ B$ ^quantity
partial microscopic diffusion control (encounter control)
partial molar Gibbs energy
partial molar quantity
partial order of reaction^quantity
partial pressure
partial rate factor
partial specific volume, $v B$
partially draining
particle concentration in atmospheric chemistry
particle density in nuclear chemistry
particle induced X-ray emission analysis
particle scattering factor
particle scattering function
particle size distribution in atmospheric chemistry
particle size in atmospheric chemistry
particular property
particulate carbon
particulate gel
particulate matter in atmospheric chemistry
particulate sol
partition
partition chromatography
partition coefficient
partition constant, $K D o$ ^quantity
partition function
partition isotherm in chromatography
partition ratio, $K D$ ^quantity
partly open film
pascal ^unit
passivation in electrochemical corrosion
passivation potential in electrochemical corrosion
passive metal
passive sampler
passive state in electrochemical corrosion
Paterno–Büchi reaction
pattern recognition
paucidisperse system
Pauli exclusion principle
PDC
PDMR
peak analysis
peak area in chromatography
peak area method
peak base in chromatography
peak concentration (trace atmospheric component)
peak current
peak elution volume (time), $V ̄ R$ , $t ̄ R$ in column chromatography
peak enthalpimetry
peak fitting
peak height in chromatography
peak in chromatography
peak maximum in chromatography
peak potential
peak resolution, $R s$ in chromatography^quantity
peak widths in chromatography
pectins
Peierls distortion
Peierls transition
pellicular packing in chromatography
penams
pendant chain
pendant group (side group)
penems
penetrant (permeant)
penetration depth
penicillins
Penning gas mixture
pentads in polymers
pentaprismo-
peptides
peptidoglycan
peptization
peptization in colloid chemistry
per acids
percent
percent diastereoisomer excess
percent enantiomer excess
percentage error
percentage exposed in metallic catalysts
percentage relative error, $e r$ (%)
percentage standard deviation, $s r$ (%), $σ r$ (%)
perfect network
perfect polymer network
perfectly polarized interphase
perfusion stationary phase (material) in liquid chromatography
pericyclic reaction
perikinetic aggregation in colloids
period, $T$ ^quantity
periodic copolymer
periodic copolymerization
periodic voltage
peripheral atom in organic reaction mechanisms
periplanar
periselectivity
peritectic reaction
peritectoid reaction
peritectoid temperature
permanent crosslink
permeability, $μ$ ^quantity
permeability of vacuum, $μ 0$ ^constant
permeate
permeation chromatography
permeation tube
permittivity, $ɛ$ ^quantity
permittivity of vacuum^constant
permselectivity
peroxides
peroxisome
peroxo compounds
peroxy acids
perpendicular effect
persistence length in polymers
persistent
perspective formula
perstraction
perturbation theory
perturbed dimensions in polymers
pervaporation
pesticide
pesticide residue
peta^{SI unit prefix}
petroleum coke
petroleum pitch
pH^quantity
pH glass electrode
pH gradient in electrophoresis
pH standard
pH-rate profile
pH_0.5 or pH_1/2 in solvent extraction
phantom chain behaviour
pharmacodynamics
pharmacokinetics
phase
phase domain
phase fluorimetry
phase I reaction of biotransformation
phase II reaction of biotransformation
phase interaction
phase inversion
phase ratio, $β$ in chromatography^quantity
phase ratio, $r$ in liquid-liquid distribution^quantity
phase ripening
phase rule
phase separation
phase transition
phase-space theory
phase-transfer catalysis
phenolates
phenols
phenomenological equation
phenonium ions
phenotype
phenoxides
pheromone
phonon
phosphanes
phosphanylidenes
phosphatidic acids
phosphazenes
phosphine oxides
phosphines
phosphinic acids
phosphinidenes
phosphinous acids
phospho
phosphoglycerides
phospholipids
phosphonic acids
phosphonitriles
phosphonium compounds
phosphonium ylides
phosphono
phosphonous acids
phosphoramides
phosphoranes
phosphoranyl radicals
phosphorescence
phosphorescence lifetime
phosphorimetry
phosphoroscope
phosphorus ylides
phosphorylation
phosphylenes
photo-Bergman cyclization
photo-Claisen rearrangement
photo-curing
photo-elastic polymer
photo-Fries rearrangement
photoacoustic detector
photoacoustic effect
photoacoustic spectroscopy
photoadsorption
photoaffinity labelling (PAL)
photoassisted catalysis
photobiology
photocatalysis
photocatalyst
photocatalytic cell
photochemical curing
photochemical detector
photochemical equivalence
photochemical funnel
photochemical hole burning
photochemical nitrogen extrusion
photochemical reaction
photochemical reaction path
photochemical smog
photochemical yield
photochemistry
photochromism
photoconductive detector
photoconductivity
photocrosslinking
photocurrent yield
photocyclization
photocycloaddition
photodecarbonylation
photodecarboxylation
photodeconjugation
photodegradation
photodesorption
photodetachment of electrons
photodiode
photodiode array
photodynamic effect
photoelectric attenuation coefficient
photoelectric detector
photoelectric peak
photoelectrical effect
photoelectrochemical cell
photoelectrochemical etching
photoelectrochemistry
photoelectrolytic cell
photoelectron spectroscopy (PES)
photoelectron yield
photoemissive detector
photoexcitation
photogalvanic cell
photohydration
photoimaging
photoinduced electron transfer
photoinduced polymerization
photoinitiation
photoionization
photoionization detector in gas chromatography
photoisomerization
photoluminescence
photoluminescent polymer
photolysis
photometry
photomultiplier tube
photon
photon activation
photon counting
photon echo
photon emittance^quantity
photon exitance, $M p$ ^quantity
photon exposure, $H p$ ^quantity
photon flow, $Φ p$ ^quantity
photon fluence, $H p , o$ , $F p , o$ ^quantity
photon fluence rate, $E p , o$ ^quantity
photon flux, $q p$ , $Φ p$ ^quantity
photon irradiance, $E p$ ^quantity
photon number, $N p$ ^quantity
photon quantities
photon radiance, $L p$ ^quantity
photooxidation
photooxygenation
photopeak
photophoresis
photophosphorylation
photophysical processes
photopolymerization
photoreaction
photorearrangement
photoreduction
photoresist
photoselection
photosensitive polymer
photosensitization
photosensitizer
photostationary state
photosynthesis
photosystem
photothermal effect
photothermography
phototransistor
photovoltaic cell
phthaleins
phthalides
physical adsorption
physical network
physical quantity (measurable quantity)
physisorption (physical adsorption)
phytotoxicant
pico^{SI unit prefix}
picrates
PICT
piezoelectric polymer
piezoluminescence
pile-up in radioanalytical chemistry
PIN (p-intrinsic-n) diode
PIN semiconductor detector
pinacols
pinocytosis
pitch
pitch-based carbon fibres
pitting corrosion
Pitzer strain
planar chirality
planar chromatography
planar film
planar intramolecular charge transfer (PICT)
planar stereoisomerism
Planck constant
plane angle
plasma desorption ionization in mass spectrometry
plasma in biology
plasma in spectrochemistry
plasmid
plastic flow
plastic transition
plate height, $H eff$ in chromatography
plate number, $N$ in chromatography^quantity
plateau border in surface chemistry
PLED
pleiotropic gene
ploidy
plug-flow in catalysis
plumbylenes
plumbylidenes
plume in atmospheric chemistry
plus, minus
pneumatic detector
point group
point of zero charge (p.z.c.)
poise ^unit
poison in catalysis
Poisson distribution
polar aprotic solvent
polar effect
polar solvent
polarity
polarizability^quantity
polarization, $P$ ^quantity
polarization error in spectrochemical analysis
polarization, $ζ$ in electrochemistry^quantity
polarized interphases
polarography
polaron
pollution (pollutant)
pollution rose
polyacid
polyaddition
polyampholyte
polybase
polybetaine
polychromator
polycondensation
polycrystalline graphite
polycyclic system
polydent
polydisperse medium
polydisperse polymer
polyelectrolyte
polyelectrolyte complex
polyelectrolyte gel
polyelectrolyte network
polyfunctional catalysis
polygranular carbon
polygranular graphite
polyhedral symbol
polyhedranes
polyions
polyketides
polymer
polymer alloy
polymer blend
polymer catalyst
polymer compatibilizer
polymer complex formation
polymer complexation
polymer composite
polymer crystal
polymer crystallite
polymer cyclization
polymer degradation
polymer drug
polymer electrolyte
polymer functionalization
polymer gel
polymer membrane
polymer molecule
polymer network
polymer phase-transfer catalyst
polymer reactant
polymer reaction
polymer reagent
polymer solvent
polymer sorbent
polymer support
polymer surfactant
polymer-clay composite
polymer-clay hybrid
polymer-derived ceramic (PDC)
polymer-metal complex
polymer-poor phase
polymer-rich phase
polymer-supported catalyst
polymer-supported reaction
polymer-supported reagent
polymerase chain reaction (PCR)
polymeric
polymeric electrolyte
polymeric inner salt
polymeric sol
polymeric stationary phase (material) in liquid chromatography
polymerization
polymer–polymer complex
polymer–solvent interaction
polymolecularity correction
polymorphic transition
polypeptides
polyprenols
polyquinanes (polyquinenes)
polysaccharides
polysulfanes
polysulfides
polytopal rearrangement
polytypic transition
pooled relative standard deviation
pooled standard deviation
population inversion
pore size distribution
Porod–Kratky chain in polymers
porosity
porous-layer open-tabular (PLOT) column in chromatography
porphyrinogens
porphyrins
position-sensitive photomultiplier tube
positive feedback
positive ion in mass spectrometry
positron
positronium
post-column derivatization in chromatography
post-filter effect in luminescence spectroscopy
postprecipitation
potential at the point of zero charge (p.z.c.)
potential energy, $E p$ , $V$ ^quantity
potential of a cell reaction
potential temperature
potential-determining (p.d.) ions
potential-energy profile
potential-energy (reaction) surface
potentiation
potentiometer
potentiometric detection method in electrochemical analysis
potentiometric selectivity coefficient
power, $P$ ^quantity
power level
pre-association
pre-ceramic
pre-ceramic material
pre-equilibrium in solvent extraction
pre-equilibrium (prior equilibrium)
pre-exponential factor, $A$ ^quantity
pre-filter effect in luminescence spectroscopy
pre-gel regime
pre-gel state
pre-polymer
pre-polymer molecule
pre-reactive complexes
precipitation
precipitation fractionation of polymers
precipitation from homogeneous solution (pfhs) in analysis
precipitation in sol-gel processing
precipitation titration
precision
precision of a balance
precision of a weighing
precision of indication of a balance
preconcentration coefficient of a desired microcomponent in trace analysis
preconcentration in trace analysis
precursor complex
precursor in radioanalytical chemistry
precursor ion in mass spectrometry
predissociation
preferential sorption in polymers
premium coke
premix burner in flame spectroscopy
prenols
prepolymer
prepreg
pressure, $p$ ^quantity
pressure flow
pressure gradient correction factor in gas chromatography
pressure jump
pressure-induced transition
pressure-sensitive detector
pretreatment of a catalyst
primary crystallization
primary current distribution
primary electrons (pe) in in situ microanalysis
primary excitation of X-rays
primary isotope effect
primary kinetic electrolyte effect
primary kinetic isotope effect
primary mixture
primary particle in catalysis
primary pH standards
primary photochemical process (primary photoreaction)
primary (photo)process
primary (photo)product
primary pollutant in atmospheric chemistry
primary sample
primary standard
primary structure
primary structure of a segment of a polypeptide
primitive change
principal group
principal ion in mass spectrometry
principal moments of inertia
principle of least nuclear motion
principle of microscopic reversibility
principle of minimum structural change
prior distribution, $P 0$
prior equilibrium
priority
pro-E, pro-Z
pro-R, pro-S
probability density, $P$
probability, $P$
probe in biotechnology
process
prochirality
prochirality centre
product
product development control
product ion
product state distribution
product-determining step
productivity, $r$ in biotechnology^quantity
progenitor ion in mass spectrometry
program
programmed-flow chromatography (flow programming)
programmed-pressure chromatography (pressure programming)
programmed-temperature chromatography (temperature programming)
projection formula
prolate trochoidal mass spectrometer
promoter (gene technology)
promoter in catalysis
promotion
prompt coincidence
prompt neutrons
propagating reaction
propagation
propellanes
property
prophage
proportional counter
proportional counter tube
proportional gas-scintillation counter
proprochirality
pros in histidine nomenclature
prostaglandins
prostanoids
prosthetic group
proteases
protected lyophobic colloid
protection of a reactive group
protective action in colloid chemistry
protein engineering
proteins
proteoglycan
proteome
protic
protide
protio
protium
protogenic (solvent)
protolysis
proton
proton affinity
proton charge^constant
proton magnetic moment^constant
proton magnetogyric ratio
proton number^quantity
proton rest mass^constant
proton transfer reaction
protonated molecule in mass spectrometry
protonation constant
protophilic (solvent)
protoplast
prototrophs
prototropic rearrangement (or prototropy)
pseudo acids
pseudo bases
pseudo rate constant
pseudo-asymmetric carbon atom
pseudo-axial
pseudo-catalysis
pseudo-co-oligomer
pseudo-copolymer
pseudo-equatorial
pseudo-first-order rate coefficient^quantity
pseudo-first-order reaction
pseudo-unimolecular
pseudo-zero-order reaction
pseudohalogens
pseudomolecular rearrangement
pseudopericyclic
pseudorotation
pseudoureas
psychosine
psychrometric hygrometer
psychrometry
puffing
puffing inhibitor
pulsatance^quantity
pulse amplitude analyser
pulse amplitude selector
pulse duration in electroanalytical chemistry
pulse height analyser
pulse reactor in catalysis
pump-dump-probe technique
pump-probe technique
purine bases
pyramidal inversion
pyranoses
pyrimidine bases
pyro
pyroelectric detector
pyrolysis
pyrolysis-gas chromatography
pyrolytic carbon
pyrolytic graphite
pyrromethenes
Q-switched laser
QC/MM
QM/MM
QSAR
quadratic mean, $x ̄ q$
quadro-
quadrupole ion storage trap (Quistor)
quadrupole mass analyser
quadrupole splitting in Mössbauer spectroscopy
qualitative analysis
qualitative elemental specificity in analysis
quality assurance
quality control
quality factor in nuclear analytical chemistry
quality of solvent in polymer chemistry
quantitative analysis
quantitative structure–activity relationship (QSAR) in drug design
quantitative structure–activity relationships (QSAR)
quantity
quantity calculus
quantity of dimension one (dimensionless quantity)
quantized internal energy
quantum counter
quantum efficiency
quantum mechanics/molecular mechanics (QM/MM)
quantum of radiation
quantum well multilayer
quantum yield, $Φ$ ^quantity
quantum-mechanical tunnelling
quarter-transition-time potential
quartet state
quartz–iodine lamp
quasi-axial
quasi-classical trajectory (QCT) method
quasi-enantiomers
quasi-equatorial
quasi-equilibrium
quasi-molecular ion in mass spectrometry
quasi-racemic compound
quasi-single-strand polymer
quaternary ammonium compounds
quaternary structure
quaterpolymer
quencher
quenching
quenching constant in photochemistry
quenching correction in photochemistry
quinarenes
quinhydrones
quinomethanes
quinomethides (quinone methides)
quinone diazides
quinones
quinonimines (quinone imines)
quinonoximes
Quistor
ρ-value (rho-value)
ρσ-equation (rho-sigma equation)
r, s
R, S
R*, S*
rabbit
rac
racemate
racemic
racemic compound
racemic conglomerate
racemic mixture
racemization
racemo structures in polymers
rad ^unit
radial development
radial electrostatic field analyser in mass spectrometry
radial elution (radial development) or circular elution (circular development) in planar chromatography
radian ^unit
radiance, $L$ ^quantity
radiant emittance^quantity
radiant energy, $Q$ ^quantity
radiant energy density, $ρ$ , $w$ ^quantity
radiant energy fluence rate^quantity
radiant (energy) flux, $P$ , $Φ$ ^quantity
radiant exitance, $M$ ^quantity
radiant exposure, $H$ ^quantity
radiant flux
radiant intensity, $I$ ^quantity
radiant power, $P$ ^quantity
radiant quantities
radiation
radiation chemistry
radiation constants
radiation continuum in spectrochemistry
radiation counter
radiation detector
radiation hazard
radiation reaction
radiation spectrum
radiation trapping
radiationless deactivation
radiationless decay
radiationless transition
radiative absorption in spectrochemistry
radiative capture
radiative de-excitation in spectrochemistry
radiative energy transfer
radiative lifetime, $τ 0$ ^quantity
radiative transition
radical anion
radical cation
radical centre(s)
radical combination
radical copolymerization
radical disproportionation
radical (free radical)
radical ion
radical pair (geminate pair)
radical photosubstitution
radical polymerization
radicofunctional name
radioactive
radioactive age
radioactive chain
radioactive contamination
radioactive cooling
radioactive dating
radioactive decay
radioactive equilibrium
radioactive fallout
radioactive half life
radioactive series
radioactive source
radioactive tracer
radioactive tracer technique in analysis
radioactive waste
radioactivity
radioanalytical chemistry
radiochemical activation analysis
radiochemical purification
radiochemical purity
radiochemical separation
radiochemical yield
radiochemistry
radiochromatograph
radiocolloid
radioenzymatic assay
radiograph
radiogravimetric analysis
radioimmunoassay
radioiodination
radioisotope
radioisotope dilution analysis
radioisotope induced X-ray emission analysis
radioluminescence
radiolysis
radiometric analysis
radiometric titration
radiometry
radionuclide
radionuclidic purity
radioreceptor assay
radiorelease analysis
radiosonde
radius of gyration, $s$
raffinate
rain out in atmospheric chemistry
random coil in polymers
random coincidence in nuclear chemistry
random copolymer
random copolymerization
random error
random sample
range in analysis
range of measurement of an analyser
Raoult's law
rate
rate coefficient
rate constant, $k$ ^quantity
rate law (empirical differential rate equation)
rate of appearance^quantity
rate of change of a quantity
rate of change ratio
rate of consumption, $v n , B$ or $v c , B$
rate of conversion, $ξ .$ ^quantity
rate of disappearance
rate of fluid consumption, $q V$ in flame emission and absorption spectrometry^quantity
rate of formation, $v n , y$ or $v c , y$
rate of liquid consumption in flame spectroscopy
rate of migration, $v$ in electrophoresis
rate of nucleation
rate of reaction, $v$ ^quantity
rate-controlling step
rate-determining step (rate-limiting step)
ratemeter in radiochemistry
ratio
raw coke
Rayleigh ratio
Rayleigh scattering
rayon-based carbon fibres
Re, Si
re-extraction
reactance, $X$ ^quantity
reactant
reacting bond rules
reaction
reaction barrier
reaction chromatography
reaction coordinate
reaction cross-section, $σ r$ ^quantity
reaction dynamics
reaction injection moulding (RIM)
reaction intermediate
reaction mechanism
reaction path
reaction path degeneracy
reaction probability, $P r$
reaction stage
reaction step
reaction time
reactive adsorption
reactive blending
reactive complex
reactive desorption
reactive polymer
reactive polymer processing
reactive (reactivity)
reactive scattering
reactivity index
reactivity–selectivity principle (RSP)
readability of a balance
reading
reagent
real (electrified) interphase
real potential of a species in a phase
real surface (interface) area
rearrangement
rearrangement ion in mass spectrometry
rearrangement stage
rebound reaction
receptor
receptor in drug design
recognition site
recoil in radioanalytical chemistry
recoil labelling
recoil-free fraction in Mössbauer spectrometry
recombinant DNA technology
recombination fluorescence
reconstructive transition
recovery
recovery factor in an extraction process
recrystallization
red shift
redox ion exchangers
redox polymer
redox potential
reduced adsorption
reduced limiting sedimentation coefficient
reduced mass, $μ$ ^quantity
reduced mobile phase velocity, $v$ in chromatography
reduced osmotic pressure
reduced sample
reduced sedimentation coefficient
reduced species
reduced viscosity of a polymer
reducing in analytical chemistry
reduction
reductive elimination
reductones
referee sample
reference atom in organic reaction mechanisms
reference cell (or blank cell) in spectrochemical analysis
reference dose (RfD)
reference electrode
reference material
reference method
reference procedure in analysis of trace air constituents
reference state of an element
reference value pH standard
reflectance, $ρ$ ^quantity
reflectance factor^quantity
reflection electron energy loss spectroscopy (REELS)
reflection factor
reflection high energy electron diffraction (RHEED)
reflectivity^quantity
refraction effects
refractive index, $n$ ^quantity
refractive index increment in polymer chemistry
regeneration of a catalyst
regioselectivity (regioselective)
regresssion analysis
regular block in a polymer
regular coke
regular comb macromolecule
regular macromolecule
regular oligomer molecule
regular polymer
regular single-strand polymer
regular star macromolecule
regulator gene
Rehm–Weller equation
reinforced reaction injection moulding (RRIM)
Reissert compounds
rel
relative
relative activity
relative adsorption
relative atomic mass (atomic weight), $A r$ ^quantity
relative biological effectiveness of radiation
relative configuration
relative counting in nuclear chemistry
relative density, $d$ ^quantity
relative detection limit
relative electrode potential
relative elongation
relative error
relative hardness
relative humidity
relative local current density
relative micellar mass
relative molar mass
relative molecular mass, $M r$ ^quantity
relative permeability, $μ r$ ^quantity
relative permittivity, $ɛ r$ ^quantity
relative preconcentration in trace analysis
relative responsivity^quantity
relative retardation, $R rel$ in planar chromatography^quantity
relative retention, $r$ in column chromatography^quantity
relative selectivity in catalysis
relative spectral responsivity
relative standard deviation, $s r$ , $σ r$
relative uncertainty
relative viscosity
relative viscosity increment
relative volumic mass
relativistic effects
relaxation
relaxation kinetics
relaxation time
releaser in analytical flame spectroscopy
rem ^unit
Renner–Teller effect
reorganization energy in electron transfer
reorganization in polymers
repeatability
repeating distance
(chain) repeating distance
repetency
replacement name
replacement operation in organic nomenclature
replicate (duplicate) sample
replication
report in analysis
reprecipitation
representative sample
repression
reproducibility
repulsive potential-energy surface
reserve sample
residence time
residence time (hydraulic retention time), $t r$ in biotechnology^quantity
residual current
residual emission anisotropy^quantity
residual fuel/oil
residual liquid junction (potential) error in pH measurement
residual spectrum/background spectrum in mass spectrometry
resin
resist polymer
resistance, $R$ ^quantity
resistivity, $ρ$ ^quantity
resolution in gas chromatography
resolution in mass spectroscopy
resolution in optical spectroscopy
resolution in stereochemistry
resolving power in mass spectrometry
resolving power, $R$ in optical spectroscopy^quantity
resolving time correction in nuclear analytical chemistry
resolving time in nuclear analytical chemistry
resonance
resonance absorption technique
resonance broadening of a spectral line
resonance cross-section in Mössbauer spectrometry
resonance effect
resonance effect magnitude in Mössbauer spectrometry
resonance emission
resonance energy
resonance energy in radiochemistry
resonance fluorescence
resonance fluorescence technique
resonance hybrid
resonance integral, $H r s$
resonance integral in radiochemistry
resonance lamp
resonance line in photochemistry
resonance line in X-ray spectroscopy
resonance neutrons
resonance radiation
response constant in electroanalytical chemistry
response time, $τ R$ of a detector^quantity
response time of an analyser
responsive gel
responsivity, $R$ in detection of radiation^quantity
rest point of a balance
restricted rotation
restriction enzymes
result in analysis
retardation factor, $R$ in column chromatography^quantity
retardation factor, $R F$ in planar chromatography^quantity
retarder
retentate
retention efficiency in particle separation
retention factor, $k$ in column chromatography^quantity
retention in nuclear chemistry
retention index, $I$ in column chromatography^quantity
retention of configuration
retention temperature in chromatography
retention time in chromatography
retention volumes in chromatography
reticulation in catalysis
retinoids
retro
retro-ene reaction
retroaddition
retrocycloaddition
reverse micelle (or reversed micelle)
reverse osmosis
reverse transcriptases
reversed direct-injection burner in analytical flame spectroscopy
reversed (radiochemical) isotope dilution analysis
reversed-phase chromatography
reversible network
reversible transition
revolutions per minute (rpm)
$R F$ value in chromatography
rheology
rheopexic gel
rheopexy
rheotropic gel
rhodamine dyes
rhombohedral graphite
ribbon delocalisation
ribonucleic acids (RNA)
ribonucleotides
ribosomal RNA (rRNA)
ribosomes
Rice–Ramsperger–Kassel (RRK) theory
Rice–Ramsperger–Kassel–Marcus (RRKM) theory
riffling in analytical chemistry
rigid chain
RIM
ring assembly
ring reversal (ring inversion)
ring-opening copolymerization
ring-opening polymerization
ring-sector
Ringelmann chart in atmospheric chemistry
ringing gel
rise time of a radiation detector^quantity
rise time of an analyser
(vertical) rise velocity in flame emission and absorption spectrometry, vf
risk
risk assessment
risk estimation
Ritchie equation
$R M$ value in planar chromatography^quantity
RNA
rod-like morphology
röntgen ^unit
root-mean-square end-to-end distance, $< r 2 > 1 / 2$ in polymers
Rosanoff convention
rotamer
rotational barrier
rotational constants
rotational correlation time, $τ c$ or $θ$ ^quantity
rotational diffusion
rotational diffusion coefficient
rotational frequency, $f rot$ in centrifugation^quantity
rotational relaxation time, $ρ$ ^quantity
rotational term, $F$ ^quantity
rotator phase transition
rotatory power
rotaxanes
rotenoids
rotometer in atmospheric chemistry
roughness factor (rugosity) of a surface
rovibronic state
R_p, S_p
RRIM
rRNA
RS
rubredoxin
ruby laser
rupture of a thin film
Rutherford backscattering (RBS)
Rydberg constant^constant
Rydberg orbital
Rydberg state
Rydberg transition
RYDMR
σ, π (sigma, pi)
σ → σ* transition
σ-adduct
σ-bond
σ-constant
σ-orbital
S
s-cis, s-trans
saccharides
Sackur–Tetrode constant
sacrificial acceptor
sacrificial donor
sacrificial hyperconjugation
saddle point
salami-like morphology
salt
salt effect
salt form of an ion exchanger
salting out
sample error in spectrochemical analysis
sample handling in analysis
sample in analytical chemistry
sample injector in chromatography
sample unit
sampler
sampling error
sampling interval in electroanalysis
sampling plan in analytical chemistry
sampling time in electroanalysis
sandwich compounds
sanitary land fill
saprophyte
saturated solution
saturation
saturation activity
saturation capacity
saturation fraction, $s B$ ^quantity
saturation in radioanalytical chemistry
saturation loading
saturation transfer
saturation vapour pressure
sawhorse projection
Saytzeff rule
sc
scaler
scaling circuit
scaling factor
scanning electron microscopy (SEM)
scanning method in mass spectrometry
scanning transmission electron microscopy (STEM)
scattering
scattering angle, $θ$ ^quantity
scattering cross-section, $σ scat$
scattering error in spectrochemical analysis
scattering matrix
scattering plane
scattering vector
scavenger
scavenging
Schenck reaction
Schenck-sensitization mechanism
Schiff bases (Schiff's bases)
Schiller layers
Schottky-barrier photodiode
Schulze–Hardy rule
Schulz–Zimm distribution
scintillation
scintillation counter
scintillation detector
scintillation spectrometer
scintillators
scrambling
scrubber in atmospheric chemistry
scrubbing
seco-
second ^unit
second messenger
second of arc
second-order transition
secondary crystallization
secondary current distribution
secondary electron multiplier in mass spectrometry
secondary electron yield in in situ microanalysis
secondary electrons (se) in in situ microanalysis
secondary excitation of X-rays
secondary fluorescence in X-ray emission spectroscopy
secondary ionization in mass spectrometry
secondary isotope effect
secondary kinetic electrolyte effect
secondary kinetic isotope effect
secondary metabolites
secondary pollution (emissions)
secondary radiation
secondary standard
secondary structure
secular equation
secular equilibrium
sediment
sedimentation
sedimentation coefficient, $s$ ^quantity
sedimentation equilibrium
sedimentation field strength
sedimentation in chemistry
sedimentation potential difference (sedimentation potential)
sedimentation velocity method
sedimentation velocity, $v B$
sedimentation volume
segment in analytical chemistry
segmented copolymer
segregated star macromolecule
segregation
segregation in polymers
selected area electron diffraction (SAED)
selected ion monitoring in mass spectrometry
selection in biotechnology
selection rule
selective corrosion
selective detector
selective digestion in spectrochemical analysis
selective elution in chromatography
selective in analysis
selective inhibition in catalysis
selective micro-sample in spectrochemical analysis
selective poisoning in catalysis
selective preconcentration in trace analysis
selective sample
selective solvent in polymer chemistry
selective sorption in polymer chemistry
selectively labelled
selectivity
selectivity coefficient, $k A / B$ in ion exchange chromatography
selectivity factor in ion exchange chromatography
selectivity factor, $S f$ ^quantity
selectivity in analysis
selectivity of a reagent
selectivity ratio
selenenic acids
selenides
seleninic acids
selenocyanates
selenols
selenones
selenonic acids
selenoxides
self inductance, $L$ ^quantity
self-absorption
self-absorption broadening of a spectral line
self-absorption effect in luminescence spectroscopy
self-absorption factor of a radiation source
self-diffusion coefficient
self-localized excitations in conjugated organic polymers
self-poisoning in catalysis
self-quenching
self-reversal
self-shielding
selones
semi-empirical quantum mechanical methods
semi-interpenetrating polymer network (SIPN)
semi-rigid chain
semicarbazones
semicoke
semiconductor
semiconductor detector
semiconductor laser
semiconductor-metal transition
semioxamazones
semiquinones
semisystematic name (semitrivial name)
seniority (senior) in organic nomenclature
sensitive area of a radiation detector
sensitive volume of a radiation detector
sensitivity in mass spectrometry
sensitivity, $A$ in metrology and analytical chemistry^quantity
sensitization
sensitization in colloid chemistry
sensitized luminescence
sensitizer
separability assumption
separated flame in flame spectroscopy
separation coefficient
separation factor, $α$ in column chromatography^quantity
separation factor, $α A , B$ in liquid-liquid distribution^quantity
separation number, $SN$ in chromatography^quantity
separation temperature in chromatography
sequence
sequence rules
sequencing (proteins, nucleic acids)
sequential analyser
sequential indication of an analyser
sequential interpenetrating polymer network
sequential measuring cell
sequential sample
sequential semi-interpenetrating polymer network
sequential spectrometer
series of analytical results
serum
sesquiterpenoids
sesterterpenoids
settling chamber in atmospheric chemistry
settling error in spectrochemical analysis
settling velocity
shape selectivity in catalysis
shape-memory polymer
shear breakdown
shear dependent viscosity
shear modulus, $G$ ^quantity
shear rate
shear strain, $γ$ ^quantity
shear stress, $τ$ ^quantity
shear thickening
shear thinning
shear transition
shear viscosity
shielded flame in flame spectroscopy
shielding
shielding constant, $σ$ ^quantity
shish-kebab structure
short chain
short-chain branch
short-range intramolecular interactions in polymers
shrinkage
shut-down state in analysis
shut-down time in analysis
shuttle vector
Si
SI
sialon
side chain
side group
side group or side-chain polymer liquid crystal
siemens ^unit
sievert ^unit
sigmatropic rearrangement
signal in analysis
signal sequence
silanes
silanols
silasesquiazanes
silasesquioxanes
silasesquithianes
silathianes
silazanes
silicones
siloxanes
silver film
silyl groups
silyl radicals
silylene
simple shear
simulation technique in analysis
simultaneous interpenetrating polymer network
simultaneous nucleation
simultaneous pair transitions
simultaneous reactions
simultaneous semi-interpenetrating polymer network
simultaneous spectrometer
single cell protein (SCP)
single channel pulse height analyser
single escape peak
single scattering
single-beam (luminescence) spectrometer
single-electron transfer mechanism (SET)
single-focusing mass spectrometer
single-photon counting
single-photon timing
single-step reaction
single-strand chain in a polymer
single-strand macromolecule
single-strand polymer
singlet molecular oxygen (singlet molecular dioxygen)
singlet state
singlet-singlet absorption
singlet-singlet annihilation
singlet-singlet energy transfer
singlet-triplet absorption
singlet-triplet energy transfer
singlet–triplet crossing
singly labelled
sink in atmospheric chemistry
sintering
SIPN
size-exclusion chromatography (SEC)
skeletal atom
skeletal bond
skeletal structure
skew
Slater determinant
Slater-type orbital
slip
slip casting
slot burner
slow neutrons
SM-interference
small particle in radiation scattering
smectic state
SMILES
smog chamber in atmospheric chemistry
smog in atmospheric chemistry
smog index in atmospheric chemistry
smoke
smooth transition
soap
soap curd
soap film
soft acid
soft base
soft-segment phase domain
soiling in atmospheric chemistry
sol
sol fraction
sol-gel coating
sol-gel critical concentration
sol-gel material
sol-gel metal oxide
sol-gel process
sol-gel silica
sol-gel transition
solar conversion efficiency
solar flare
solar radiation in atmospheric chemistry
solid angle, $Ω$ , $ω$ ^quantity
solid phase antibody radioimmunoassay
solid polymer electrolyte
solid solution
solid state lasers
solid support in column chromatography
solid volume in column chromatography
solidification
solidus
soliton
solubility
solubility parameter, $δ$
solubility product
solubilization
solute
solute-volatilization interference in flame spectroscopy
solution
solvation
solvation energy
solvatochromic relationship
solvatochromism
solvent
solvent extraction
solvent front in chromatography
solvent in liquid-liquid distribution
solvent ion exchange (SIX)
solvent isotope effect
solvent migration-distance in chromatography
solvent parameter
solvent regeneration in extraction processes
solvent shift
solvent-induced symmetry breaking
solvent-separated ion pair
solvent-shared ion pair
solvolysis
solvophobicity parameter, $Sp$ ^quantity
solvus
SOMO
sonication
sonogel
sonoluminescence
sonosol
soot
Soret band
sorption in colloid chemistry
sorption isotherm in ion exchange
sorption techniques in trace analysis
sorptive insertion in surface catalysis
source efficiency of a radiation source
sp
space charge in a semiconductor
space formula
space time in catalysis
space velocity in catalysis
spacer
spark (source) ionization in mass spectrometry
spatial-distribution interference in flame spectroscopy
spatially resolving detector of radiation
special salt effect
speciation analysis in chemistry
speciation in chemistry
species (taxonomic)
specific
specific acid–base catalysis
specific activity, $a$ in radiochemistry^quantity
specific adsorption
specific burn-up
specific catalysis
specific conductance
specific detector in chromatography
specific gravity
specific heat capacity, $c$ ^quantity
specific in analysis
specific ionization in nuclear chemistry
specific permeability in chromatography
specific photon emission^quantity
specific pore volume of a catalyst
specific retention volume in chromatography
specific surface area in surface chemistry
specific volume, $v$ ^quantity
specific weight
specifically absorbing ion
specifically labelled
specifically labelled tracer
specimen in analytical chemistry
spectator mechanism
spectator-stripping reaction
spectral bandwidth error in spectrochemical analysis
spectral distribution
spectral fluence rate, $E λ , o$ ^quantity
spectral intensity
spectral interference in flame spectroscopy
spectral irradiance, $E λ$ ^quantity
spectral overlap
spectral (photon) effectiveness
spectral photon exitance, $M p λ$ ^quantity
spectral photon flow, $Φ p λ$ ^quantity
spectral photon flux (photon irradiance), $E p λ$ ^quantity
spectral photon radiance, $L p λ$ ^quantity
spectral quantities
spectral radiance, $L λ$ ^quantity
spectral radiant energy, $Q λ$ ^quantity
spectral radiant exitance, $M λ$ ^quantity
spectral radiant flux
spectral radiant intensity, $I λ$ ^quantity
spectral radiant power, $P λ$ ^quantity
spectral responsivity
spectral responsivity function^quantity
spectral sensitivity, $S λ$ ^quantity
spectral sensitization
spectral spheradiance
spectrochemical buffer in atomic spectroscopy
spectrochemical carrier in atomic spectroscopy
spectrogram
spectrograph
spectrometer
spectrometry
spectroscope
spectroscopy
spectrum analysis
specular reflectance (reflection factor), $ρ$ in optical spectroscopy^quantity
speed, $v$ , $c$ ^quantity
speed distribution function, $F c$
speed of light in a vacuum^constant
spherical carbonaceous mesophase
spherical irradiance^quantity
spherical radiance
spherical radiant exposure
spherulite
spin adduct
spin conservation rule (Wigner rule)
spin contamination
spin counting
spin crossover
spin density
spin label
spin polarization
spin probe
spin projection
spin trapping
spin-allowed electronic transition
spin-flip method
spin-flip transition
spin-flop transition
spin-glass transition
spin-orbit coupling
spin-orbit coupling constant, $A$ ^quantity
spin-orbit splitting
spin-Peierls transition
spin-state transition
spin-statistical factor (in diffusion-controlled reactions)
spinodal
spinodal curve
spinodal decomposition
spin–spin coupling
spin–spin coupling constant, $J AB$
spiro atom
spiro chain in a polymer
spiro compounds
spiro macromolecule
spiro polymer
spiro union
splicing
spontaneous emission
spontaneous fission
spontaneous resolution
spot in chromatography
spot sampling
sprayer in flame spectroscopy
spread monolayer
spreading function in chromatography
spreading wetting
sputter yield
sputtering
square-wave current
SR
stability constant
stable
stable film, metastable film
stable ion in mass spectrometry
staggered conformation
stagnant inversion in atmospheric chemistry
stand-by state in analysis
standard acceleration of free fall
standard atmosphere
standard atomic weights
standard chemical potential
standard concentration
standard conditions for gases
standard deviation, $s$
standard electrode potential, $E °$
standard electromotive force
standard entropy of activation, $Δ ‡ S °$ , $Δ ‡ S$
standard equilibrium constant, $K °$ , $K$
standard Gibbs energy of activation $Δ ‡ G °$ , $Δ ‡ G$
standard hydrogen electrode
standard molality $m ⦵$ , $m °$
standard potential of an electrode reaction
standard potential of the reaction in a chemical cell
standard pressure
standard rate constant of an electrode reaction
standard reaction quantities
standard solution
standard state
standard subtraction method in electroanalytical chemistry
standard thermodynamic quantities
standard uncertainty
stannoxanes
stannylenes
stannylidenes
star copolymer
star macromolecule
star polymer
Stark effect
start-up time in analysis
starting line in chromatography
starting point in chromatography
state crossing
state diagram
state function
state-to-state kinetics
static fields mass spectrometer
static pressure
static quenching
static stability
stationary phase (fermentation)
stationary phase in chromatography
stationary phase volume, $V s$ in chromatography
stationary state
stationary-phase fraction
statistical coil in polymers
statistical copolymer
statistical copolymerization
statistical factor
statistical pseudo-copolymer
statistical segment in polymers
statistical weight^quantity
steady state approximation (treatment)
steady state in liquid-liquid distribution
steady state (stationary state)
Stefan–Boltzmann constant^constant
stem cell
stem in polymer crystals
step height in chromatography
step in chromatography
stepped surface
stepwise elution in chromatography
stepwise reaction
steradian^unit
stereoblock macromolecule
stereoblock polymer
stereochemical formula (stereoformula)
stereochemical non-rigidity
stereoconvergence
stereodescriptor
stereoelectronic
stereoelectronic control
stereoformula
stereogenic unit (stereogen/stereoelement)
stereoheterotopic
stereohomosequence in a polymer
stereoisomerism
stereoisomers
stereomutation
stereoregular macromolecule
stereoregular polymer
stereorepeating unit in a polymer
stereoselective polymerization
stereoselective synthesis
stereoselectivity
stereosequence in a polymer
stereospecific polymerization
stereospecifically labelled tracer
stereospecificity (stereospecific)
steric effect
steric factor
steric factor in polymers
steric hindrance
steric isotope effect
steric strain
steric-approach control
Stern layer
Stern–Volmer kinetic relationships
steroids
sterols
stibanes
stibanylidenes
stibines
stibinidenes
stibonium compounds
sticking coefficient in surface chemistry
sticking probability in surface chemistry
sticky ends in biotechnology
stimulated emission
stirred flow reactor in catalysis
stochastic effect
stochastic sampling
stochastic theories
Stock number
Stockholm convention
stoichiometric
stoichiometric capacity
stoichiometric concentration, $c$
stoichiometric mean molal (practical activity coefficient) in electrochemistry
stoichiometric number, $ν$ ^quantity
stoichiometry
stokes^unit
Stokes law
Stokes number, $St$ ^quantity
Stokes parameters
Stokes shift
Stokes type radiation
stopped flow
stopped-flow cell in spectrochemical analysis
stopping power
STP
strain
strain energy
strain-induced transition
stratified film
stratified sample
stratocumulus cloud
stratopause
stratosphere
stratus cloud
stray radiation error in spectrochemical analysis
streak camera
streak tube
streaming birefringence
streaming current
streaming potential difference (streaming potential)
stress graphitization
stress-assisted transition
strip dynode photomultiplier tube
stripping
stripping isotherm
stripping ratio in solvent extraction
stripping reaction
stripping solution in liquid-liquid distribution
strong collision
structural disorder
structural formula
structural stability
structural transition
structure of a catalyst
structure-based design in drug design
structure-property correlations (SPC)
structure–activity relationship (SAR)
styphnates
subchain of a polymer
subgroup-supergroup transition
subjacent orbital
sublation in solvent extraction
sublimation
subphase in thin films
subsample
substance concentration
substance content, $n / m$
substance flow rate
substance fraction, $x$ ^quantity
substituent atom (group)
substituent electronegativity
substitution reaction
substitutive name
substoichiometric extraction
substoichiometric isotope dilution analysis
substrate
substrate in biocatalysis
substrate in thin films
subtractive name
successor complex
sudden polarization
sudden potential-energy surface
sugars
suicide inhibition
suicide metabolism
sulfamic acids
sulfanes
sulfatides
sulfenamides
sulfenes
sulfenic acids
sulfenium ions
sulfenyl groups
sulfenyl nitrenes
sulfenyl radicals
sulfenylium ions
sulfides
sulfilimines
sulfimides
sulfimines
sulfinamides
sulfinamidines
sulfines
sulfinic acids
sulfinic anhydrides
sulfinimines
sulfinylamines
sulfolipids
sulfonamides
sulfonamidines
sulfonediimines
sulfones
sulfonic acids
sulfonic anhydrides
sulfonimides
sulfonium compounds
sulfonphthaleins
sulfonylamines
sulfoxides
sulfoximides
sulfoximines
sulfur diimides
sultams
sultims
sultines
sultones
sum of states, $P ɛ$
summit current in polarography
summit potential
superabsorbent polymer
superacid
superbase
superconducting transition
supercritical drying of a gel
supercritical fluid
supercritical fluid chromatography (SFC)
superequivalent adsorption
superexchange interaction
superficial work in surface chemistry
superlattice
superposability
superradiance
supersaturation
support of a catalyst
support plate in chromatography
support-coated open-tubular (SCOT) column in chromatography
supporting electrolyte
suppressor
suprafacial
supramolecular chemistry
supramolecule
surface
surface active agent
surface amount, $n s$ , $n a$ ^quantity
surface barrier semiconductor detector
surface catalysis
surface charge density, $σ$ ^quantity
surface charge layer
surface chemical potential
surface concentration, $Γ$ ^quantity
surface contamination in surface analysis
surface coverage, $θ$ ^quantity
surface crossing
surface density, $ρ A$ , $ρ S$ ^quantity
surface dilatational viscosity
surface dipole layer
surface electric potential
surface excess, $n σ$ ^quantity
surface excess concentration (at an interface), $Γ$ ^quantity
surface (excess) conductivity
surface excess energy
surface excess enthalpy
surface excess entropy
surface excess Gibbs energy
surface excess Helmholtz energy
surface excess isotherm
surface fractal dimension
surface grafting
surface ionization in mass spectrometry
surface ions
surface layer (or interfacial layer)
surface of a phase (free surface)
surface of tension
surface potential
surface pressure
surface reaction in electrochemistry
surface region
surface rheology
surface shear viscosity
surface states
surface stress, $T i j$
surface tension, $γ$ , $σ$ ^quantity
surface work
surfactant (surface active agent)
surprisal analysis
surprisal, $s$
suspended matter in atmospheric chemistry
suspension
suspension effect in an ion-selective electrode
Swain–Lupton equation
Swain–Scott equation
swelling agent
swelling in colloid and surface chemistry
swelling pressure in colloid and surface chemistry
switchboard model in polymer crystals
switching transition
sydnone imines
sydnones
sym-
symbiosis
symbol in quantities and units
symmetrical films
symmetry number, $s$ ^quantity
symmetry-breaking transition
symmetry-conserving transition
symproportionation
syn
synartetic acceleration
synchronization (principle of nonperfect synchronization)
synchronous
synchronously excited (fluorescence, phosphorescence) spectrum
synchrotron radiation
synclinal
syndet
syndiotactic macromolecule
syndiotactic polymer
syndiotactic triads in polymers
syneresis
synergism in solvent extraction
synergism in toxicology
synoptic scale
synperiplanar
syntectic reaction
synthetic graphite
system
system of units of measurement
systematic error
systematic name
Système International d'Unités
systemic effect
Szilard–Chalmers effect
θ state in polymers
θ temperature in polymers
T-jump
tactic block in a polymer
tactic block polymer
tactic macromolecule
tactic polymer
tacticity
Taft equation
tagged
tailing in chromatography
tandem mass spectrometer
target in biology
tautomeric effect
tautomerism
tautomerization
TD-DFT
tele in histidine nomenclature
tele-substitution
telechelic molecule
telechelic oligomer
telechelic polymer
tellurides
tellurones
telomer
telomerization
temperature
temperature coefficient of responsivity
temperature effect in luminescence spectroscopy
temperature inversion in atmospheric chemistry
temperature jump
temperature lapse rate in atmospheric chemistry
temperature-programmed chromatography
template in biotechnology
temporary poisoning in catalysis
tera^{SI unit prefix}
term in X-ray spectroscopy
term symbols
term, $T$ ^quantity
termination
terminator in biotechnology
termolecular
terpenes
terpenoids
terpolymer
tertiary current distribution
tertiary structure
tesla ^unit
test portion
test sample
test solution in analysis
tetracyclines
tetrads in polymers
tetrahedral intermediate
tetrahedro-
tetrapyrroles
tetraterpenoids
texture of a catalyst
theoretical ceramic yield
theoretical plate number^quantity
thermal analysis
thermal black
thermal column in nuclear chemistry
thermal conductance, $G$ ^quantity
thermal conductivity, $λ$ ^quantity
thermal conductivity detector in gas chromatography
thermal curing
thermal detector
thermal fission
thermal ionization in mass spectrometry
thermal lensing
thermal neutrons
thermal resistance, $R$ ^quantity
thermally activated delayed fluorescence
thermally-induced transition
thermoacoustimetry
thermochemical analysis
thermochemical calorie
thermochromism
thermocouple
thermodilatometry
thermodynamic control of product composition
thermodynamic energy^quantity
thermodynamic equilibrium constant
thermodynamic isotope effect
thermodynamic quality of solvent in polymer chemistry
thermodynamic temperature, $T$ ^quantity
thermodynamically equivalent sphere in polymer chemistry
thermoelectrometry
thermogram
thermogravimetry (TG)
thermoluminescence
thermolysis
thermomagnetometry
thermomechanical measurement
thermometric
thermometric enthalpy titration
thermometric titration
thermoparticulate analysis
thermophile
thermophotometry
thermopile
thermoplastic elastomer
thermoptometry
thermoreversible gel
thermoreversible junction point
thermoreversible network
thermosetting polymer
thermosonimetry
thermosphere
thermotropic mesophase
thiazynes
thick film
thickness of diffusion layer in electrochemistry
thickness of electrical double layer
thickness of reaction layer in electrochemistry
thin film
thin-layer chromatography
thio
thioacetals
thioaldehyde S-oxides
thioaldehydes
thioanhydrides
thiocarboxylic acids
thiocyanates
thioethers
thiohemiacetals
thioketone S-oxides
thioketones
thiolates
thiols
thionylamines
third body
thixotropic gel
thixotropy
thiyl radicals
threo
threo structures in a polymer
threshold energy, $E 0$ ^quantity
threshold limit value (TLV)
through-bond electron transfer
through-space electron transfer
throughput rate
throwing power
TICT
TICT emission
TICT state
tie molecule in polymers
tight ion pair
time, $t$ ^quantity
time constant, $τ c$ of a detector^quantity
time, $t$ of centrifugation^quantity
time of deactivation in heterogeneous catalysis
time of solidification of thixotropic recovery
time-correlated single photon counting
time-dependent density functional theory (TD-DFT)
time-dependent stoichiometry
time-independent stoichiometry
time-of-flight mass spectrometer
time-resolved anisotropy, $r t$ ^quantity
time-resolved fluorometry
time-resolved microwave conductivity (TRMC)
time-resolved spectroscopy
titrant
titration
titration curve
titration error
titre (titer)
tonne ^unit
topical effect
topochemical reaction
topomerization
topomers
topotactic reaction
topotactic transition
torque, $T$ ^quantity
torquoselectivity
torr ^unit
torsion angle
torsional braid analysis
torsional stereoisomers
torsional strain
total absorption peak
total chemiflux
total consumption time , $t tot$ in flame emission and absorption spectrometry^quantity
total ion current in mass spectrometry
total radiant power
total retention volume (time), $V R$ , $t R$ in column chromatography
total velocity of the analyte, $ν tot$ in capillary electrophoresis^quantity
totally porous packing in chromatography
toxicity
toxicodynamics
toxicokinetics
toxicology
toxin
toxinology
trace element
traceability
tracer
track detector (nuclear)
track (nuclear)
trajectory in reaction dynamics
trans
trans conformation in polymers
trans- in inorganic nomenclature
trans-fused
transannular strain
transcription in biotechnology
transducer
transduction in biotechnology
transfer
transfer activity coefficient, $γ t$
transfer in analysis
transfer line
transfer RNA (tRNA)
transferability
transferases
transformation
transformation in gene technology
transient (chemical) species
transient crosslink
transient junction point
transient network
transient phase (induction period)
transient spectroscopy
transient-stimulated emission pumping (TSEP)
transit time, $t ts$ in flame emission and absorption spectrometry^quantity
transition
transition coordinate
transition (dipole) moment
transition element
transition interval in titrimetric analysis
transition layer
transition polarization
transition probability for absorption in spectrochemistry
transition probability for spontaneous emission in spectrochemistry
transition probability for stimulated emission in spectrochemistry
transition species
transition state
transition state analogue
transition state theory
transition structure
transition temperature (for liquid crystals)
transition time in electroanalytical chemistry
transition wavenumber, $ν ˜$ ^quantity
translation in biotechnology
translational spectroscopy
transmission
transmission coefficient
transmission electron energy loss spectroscopy (TEELS)
transmission electron microscopy (TEM)
transmission factor
transmission high energy electron diffraction (THEED)
transmission in mass spectrometry
transmittance, $T$ , $τ$ ^quantity
transoid conformation
transport control
transport in analysis
transport interference in flame spectroscopy
transport number, $t$ ^quantity
transposon
transtactic polymer
trapping
travel time, $t tv$ in flame emission and absorption spectrometry^quantity
treated solution in analytical chemistry
triads
triangulo-
triazanes
triazenes
triboluminescence
trimethylenemethanes
trioxides
triple point
triplet state
triplet-triplet absorption
triplet-triplet annihilation
triplet-triplet energy transfer (TTET)
triplet-triplet transitions
triprismo-
tritactic polymer
triterpenoids
tritide
tritio
tritium
triton
trivial energy transfer
trivial name
TRMC
tRNA
Troe expression
tropilidenes
tropolones
tropones
tropopause
troposphere
tropyl radicals
tropylium ions
true coincidence in radiochemistry
'true' rate constant
true value, $τ$ in analysis
TSEP
TTET
tub conformation
tunable laser in spectrochemical analysis
Tung distribution of a macromolecular assembly
tungsten lamp
tungsten-halogen lamp
tunnelling
turbidimetric titration
turbidity, $τ$ in light scattering^quantity
turnover frequency in catalysis
turnstile rotation
turntable reactor
twist form
twisted intramolecular charge transfer (TICT)
two-colour indicator
two-dimensional chromatography
two-photon excitation
two-photon photochromism
two-photon process
two-site immunoradiometric assay
u
UCST
ulosonic acids
ultimate capacity in solvent extraction
ultrafiltrate
ultrafiltration
ultrasonic detector in gas chromatography
ultraviolet (UV)
umpire sample
umpolung
unactivated adsorption process
uncertainty of measurement
uniaxial pressing
uniaxial sample
unified atomic mass unit^unit
uniform corrosion
uniform polymer
uniformly labelled
uniformly labelled tracer
unimolecular
unit cell
unit (item/portion/individual) in analytical chemistry
unit of measurement
unit system
universal calibration in chromatography
universal detector in chromatography
unperturbed dimensions in polymers
unreactive
unresolved peak in chromatography
unstable
unstable film
unstable ion in mass spectrometry
unsymmetrical films
unzipping
upconversion
upfield
uphill transport in membrane processes
upper critical solution temperature
upper limit of measurement in atmospheric trace component analysis
UPS
upstream in membrane processes
uptake
ureides
urethanes (urethans)
uronic acids
uronium salts
useful spectral range^quantity
UV
UV dose
UV photoelectron spectroscopy (UPS)
UV stabilizer
vaccine
vacuum phototube
vacuum system in mass spectrometry
valence
valence band
valence isomer
valence tautomerization
valence transition
value of a division of a precision balance scale
value of a quantity
van der Waals adsorption
van der Waals broadening of a spectral line
van der Waals forces
vaporization temperature, $T vap$ in electrothermal atomization
vapour phase interference in analysis
variable, $x$
variable pathlength cell in spectrochemical analysis
variance $V$ , $σ 2$
variational transition state theory
variegated star macromolecule
Vavilov rule
vector in biotechnology
velocity, $v$ , $c$ ^quantity
velocity in mass transport
verdazyl radicals
vertical ionization
(vertical) rise velocity, $v f$ in flame emission and absorption spectrometry
vertical transition
Verwey transition
vibrational redistribution
vibrational relaxation
vibrational term, $G$ ^quantity
vibrationally adiabatic transition-state theory
vibronic coupling
vibronic transition
vidicon
vinyl carbenes
vinylic cations
vinylic groups
vinylidenes
viologens
virial coefficients
virtual transition
viscosity
viscosity function, $Φ$ ^quantity
viscosity number of a polymer
viscosity ratio
viscous flow sintering
viscous sintering
visibility in atmospheric chemistry
visible
volatilization
volatilizer
volt ^unit
Volta potential difference
voltage in electroanalysis
voltammetric constant
volume content, $V c / m s$
volume flow rate, $q v$ ^quantity
volume fraction, $ϕ$ ^quantity
volume of activation, $Δ ‡ V$ ^quantity
volume of the stationary phase in chromatography
volume rate^quantity
volume reaction in electrochemistry
volume strain, $θ$ ^quantity
volume viscosity (or dilatational viscosity)
volumetric flowrate in gas chromatography
volumic
vulcanization
VUV
Wagner number
Walden inversion
wall-coated open-tubular (WCOT) column in chromatography
wash out in atmospheric chemistry
watt ^unit
wave height (electrochemical)
wavefunction, $Ψ$ , $ψ$ , $φ$
wavelength, $λ$ ^quantity
wavelength converter
wavelength dispersion in X-ray emission spectroscopy
wavelength error in spectrochemical analysis
wavelength-dispersive X-ray fluorescence analysis
wavenumber, $σ$ , $ν ˜$ ^quantity
weak collision
weathering
weber ^unit
wedge projection
weight, $G$ ^quantity
weight-distribution function
weighted mean
Weller correlation
Westcott cross-section
wet bulb temperature
wetting
wetting tension (or work of immersional wetting per unit area)
Wheland intermediate
Wiegner effect
Wigner matrices
Wigner rule
Wilzbach labelling
wind rose
Winstein–Holness A value
Wittig reagents
wolfram lamp
Wood horn
Wood lamp
Woodward–Hoffmann rules
work, $w$ , $W$ ^quantity
work hardening
work of adhesion
work of cohesion per unit area
work of immersional wetting per unit area
work of separation
work softening
working electrode
worm-like chain in polymers
ξ- (xi-)
x unit^unit
X-radiation
X-ray escape peak
X-ray fluorescence
X-ray fluorescence analysis
X-ray intensity
X-ray level
X-ray photoelectron spectroscopy (XPS)
X-ray satellite
X-ray spectroscopy
xanthates
xanthene dyes
xanthic acids
xanthophylls
xenobiotic
xenon lamp
xerogel
XPS
xylylenes
YAG
Yang photocyclization
yard ^unit
year ^unit
yield, $Y$ in biotechnology^quantity
yield stress
ylides
ynamines
ynols
yocto^{SI unit prefix}
yotta^{SI unit prefix}
Young's modulus^quantity
Yukawa–Tsuno equation
ζ-potential
Z
Z-value
$Z 50$ of a photochromic system
Zaitsev rule
Zeeman effect
zepto^{SI unit prefix}
zero differential overlap (ZDO) approximation
zero field splitting
zero point of a glass electrode
zero point of scale of a balance
zero–zero (0–0) absorption or emission
zeta
zetta^{SI unit prefix}
zig-zag projection
Zimm plot
zone in chromatography
zone melting method of preconcentration
Zucker–Hammett hypothesis
zwitterionic compounds/zwitterions
zwitterionic polymer
zygote