A spectroscopic technique which measures the
kinetic energy of electrons emitted upon the
ionization of a substance by high energy monochromatic photons. A photoelectron spectrum is
a plot of the number of electrons emitted versus their
kinetic energy. The spectrum consists of bands due to transitions from the
ground state of an atom or molecular entity to the ground and excited states of the corresponding
radical cation. Approximate interpretations are usually based on '
Koopmans theorem' and yield orbital energies.
PES and
UPS (
UV photoelectron
spectroscopy) refer to the
spectroscopy using vacuum
ultraviolet sources, while
ESCA (electron
spectroscopy for chemical analysis) and
XPS use X-ray sources.
Source:
PAC, 1996, 68, 2223
(Glossary of terms used in photochemistry (IUPAC Recommendations 1996))
on page 2261
PAC, 1976, 45, 221
(Nomenclature and Spectral Presentation in Electron Spectroscopy Resulting from Excitation
by Photons)
on page 223
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
