Disappearance cross section

{
  "id": "MLC-T-CHM-003275",
  "term": "Disappearance cross section",
  "field": "Chemistry",
  "definition": "The effective area per incident primary ion in static secondary ion mass spectrometry within which a surface species is damaged or removed, so that its characteristic secondary-ion signal is lost. The signal then falls exponentially with primary ion fluence. The value is of the order of 1 to 10 square nanometres for molecular ions, which sets the static limit of roughly 10 trillion primary ions per square centimetre.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "primary ion"
  ],
  "references": [
    "PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1838 (https://doi.org/10.1515/pac-2019-0404)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/disappearance-cross-section/"
}