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PAC, 1996, 68, 2223. Glossary of terms used in photochemistry (IUPAC Recommendations 1996), doi:10.1351/pac199668122223

absorbance, $A$
absorptance, $α$
absorption
absorption coefficient
absorption cross-section, $σ$
absorptivity
actinometer
action spectrum
adiabatic electron transfer
adiabatic photoreaction
annihilation
antimony–xenon lamp (arc)
apparent lifetime
argon ion laser
attenuance, $D$
attenuance filter
auxochrome
avoided crossing of potential-energy surfaces
back electron transfer
bandgap energy $E g$
bandpass filter
Barton reaction
bathochromic shift (effect)
Beer–Lambert law (or Beer–Lambert–Bouguer law)
bioluminescence
bleaching in photochemistry
blue shift
carbon dioxide laser (CO₂ laser)
cavity dumping in photochemistry
charge hopping
charge recombination
charge separation
charge shift
charge transfer transition to solvent (CTTS)
charge-transfer (CT) state
charge-transfer (CT) transition
chemical laser
chemiexcitation
chemiluminescence
chromophore
CIDEP (Chemically Induced Dynamic Electron Polarization)
CIDNP (Chemically Induced Dynamic Nuclear Polarization)
CIEEL (Chemically Initiated Electron Exchange Luminescence)
coherent radiation
collision complex
conduction band
configuration (electronic)
configuration interaction (CI)
conversion spectrum
copper vapour laser
correlation diagram
correlation energy
crystal field splitting
CT
current yield
cut-off filter
CW
dark photochemistry (photochemistry without light)
Davydov splitting (factor-group splitting)
deactivation
delayed fluorescence
depth of penetration of light
Dexter (electron exchange) excitation transfer
diabatic electron transfer
diabatic photoreaction
diode laser
dipolar mechanism of energy transfer
doublet state
driving force (affinity) of a reaction, $A$
dye laser
effectiveness
efficiency, $η$ of a step
efficiency spectrum
einstein
electrogenerated chemiluminescence (ECL)
electron correlation
electron exchange excitation transfer
electron transfer
electron transfer photosensitization
electronic energy migration (or hopping)
electronically excited state
electrophotography
emission
emission spectrum
emittance, $ɛ$
encounter complex
encounter pair
energy migration
energy storage efficiency, $η$
energy transfer in photochemistry
energy transfer plot in photochemistry
enhancer
excimer
excimer laser
exciplex
excitation spectrum
excitation transfer
excited state
exciton
exitance
external heavy atom effect
exterplex
extinction
extinction coefficient
f number
Fermi level, $E F$
flash photolysis
fluence, $F$ , $Ψ$ , $H 0$
Förster cycle
Förster excitation transfer (dipole–dipole excitation transfer)
Fourier transform spectrometer
Franck–Condon principle
free electron laser
free-running laser
frequency, $f$ , $ν$
frequency doubling
FWHM (Full Width at Half Maximum)
gas laser
Gaussian band shape
ground state
half-width of a band
Hammond–Herkstroeter plot
harmonic frequency generation
harpoon mechanism
heavy atom effect
helium–cadmium laser
helium–neon laser
Herkstroeter plot
heteroexcimer
high-pressure mercury lamp (arc)
hole burning
hole transfer
hot ground state reaction
hot quartz lamp
hot state reaction
Hund rules
Hush model
hyperchromic effect
hypochromic effect
hypsochromic shift
imaging (photoimaging)
incoherent radiation
inner filter effect
inner-sphere electron transfer
integrating sphere
intended crossing of potential-energy surfaces
intensity
interferometer
internal conversion
intersystem crossing
intervalence charge transfer
inverted region (for electron transfer)
isoabsorption point
isoclinic point
Jablonski diagram
Kaptein–Closs rules
Kasha–Vavilov rule
krypton ion laser
Lambert law
lamp
Laporte rule
laser
lasing
latent image
ligand field splitting
ligand to ligand charge transfer (LLCT) transition
ligand to metal charge transfer (LMCT) transition
light source
Lorentzian band shape
luminescence
lumiphore (luminophore)
Marcus inverted region (for electron transfer)
Marcus–Hush relationship
merry-go-round reactor (turntable reactor)
metal to ligand charge transfer (MLCT) transition
metal to metal charge transfer (MMCT) transition
mode-locked laser
multiphoton absorption
multiphoton process
multiplicity (spin multiplicity)
n → π* state
n → π* transition
n → σ* transition
neodymium laser
nitrogen laser
non-linear optical effect
non-radiative decay
nonadiabatic electron transfer
nonadiabatic photoreaction
ODMR (Optically Detected Magnetic Resonance)
optical density
optical filter
oscillator strength, $f i j$
outer-sphere electron transfer
oxa-di-π-methane rearrangement
π – π* state
π → π* transition
π → σ* transition
Paterno–Büchi reaction
phosphorescence
photo-Fries rearrangement
photoacoustic effect
photoacoustic spectroscopy
photoassisted catalysis
photochemical hole burning
photochemistry
photoconductivity
photocrosslinking
photocurrent yield
photodegradation
photodetachment of electrons
photodynamic effect
photoelectrical effect
photoelectrochemical cell
photoelectrochemical etching
photoelectrochemistry
photoelectron spectroscopy (PES)
photoexcitation
photogalvanic cell
photoinduced electron transfer
photoinduced polymerization
photoinitiation
photoionization
photon
photon flow, $Φ p$
photooxidation
photooxygenation
photophysical processes
photopolymerization
photoreduction
photoresist
photosensitization
photosensitizer
photostationary state
photothermal effect
photothermography
photovoltaic cell
piezoluminescence
population inversion
precursor complex
predissociation
primary photochemical process (primary photoreaction)
primary (photo)process
primary (photo)product
Q-switched laser
quantum counter
quantum efficiency
quantum of radiation
quartet state
quencher
quenching constant in photochemistry
radiant energy, $Q$
radiationless transition
radiative transition
radical pair (geminate pair)
radioluminescence
red shift
relative spectral responsivity
resonance absorption technique
resonance fluorescence
resonance fluorescence technique
resonance line in photochemistry
resonance radiation
rovibronic state
ruby laser
Rydberg orbital
Rydberg transition
σ → σ* transition
sacrificial acceptor
sacrificial donor
scintillators
selection rule
self-absorption
self-quenching
sensitization
sensitizer
simultaneous pair transitions
singlet state
singlet-singlet annihilation
singlet-singlet energy transfer
singlet-triplet energy transfer
solar conversion efficiency
solid state lasers
solvatochromism
solvent shift
sonoluminescence
spectral irradiance, $E λ$
spectral overlap
spectral (photon) effectiveness
spectral photon exitance, $M p λ$
spectral photon flow, $Φ p λ$
spectral photon flux (photon irradiance), $E p λ$
spectral photon radiance, $L p λ$
spectral radiance, $L λ$
spectral radiant exitance, $M λ$
spectral radiant flux
spectral radiant intensity, $I λ$
spectral radiant power, $P λ$
spectral responsivity
spectral sensitization
spherical radiance
spherical radiant exposure
spin conservation rule (Wigner rule)
spin-allowed electronic transition
spin-orbit coupling
spin-orbit splitting
spin–spin coupling
spontaneous emission
Stark effect
state crossing
state diagram
Stern–Volmer kinetic relationships
stimulated emission
Stokes shift
superexchange interaction
superradiance
surface crossing
thermal lensing
thermally activated delayed fluorescence
thermochromism
thermoluminescence
through-bond electron transfer
through-space electron transfer
TICT emission
TICT state
time-correlated single photon counting
time-resolved spectroscopy
transient spectroscopy
transition polarization
transmittance, $T$ , $τ$
triboluminescence
triplet state
triplet-triplet annihilation
triplet-triplet energy transfer
triplet-triplet transitions
tunnelling
two-photon excitation
two-photon process
UV dose
UV photoelectron spectroscopy
UV stabilizer
Vavilov rule
vibrational redistribution
vibrational relaxation
vibronic coupling
vibronic transition
wavelength, $λ$
wavenumber, $σ$ , $ν ˜$
Wood horn
xenon lamp
Zeeman effect
zero field splitting
zero–zero (0–0) absorption or emission