Sub-shell photoionization cross section

{
  "id": "MLC-T-CHM-011521",
  "term": "Sub-shell photoionization cross section",
  "field": "Chemistry",
  "definition": "A measure of the probability that a photon of a given energy will eject an electron from a specific atomic sub-shell. This cross section is dependent on the photon energy and the electronic configuration of the atom. It is a fundamental parameter in X-ray photoelectron spectroscopy (XPS) for quantifying elemental composition.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "photoionization cross section",
    "shakeup",
    "shakeoff"
  ],
  "references": [
    "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)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/sub-shell-photoionization-cross-section/"
}