Cross section for an incident photon interacting with a material to produce one or more photoelectrons from a given sub-shell.
Note: Photoionization from one sub-shell can lead to
shake-up or
shakeoff of electrons from other shells.
See: photoionization cross section
Source:
PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1830 (https://doi.org/10.1515/pac-2019-0404)