disappearance cross section

https://doi.org/10.1351/goldbook.09396
Cross section for the loss of intensity of an ion signal observed as a result of the bombardment by primary ions.
Notes:
  1. The ion signal used is usually that for a large or characteristic fragment of the molecule, such as a cationized ion, protonated ion, or deprotonated ion from the molecule, at a surface.
  2. Generally, the larger the molecule, the larger the disappearance cross section.
  3. It is often assumed that the material being studied is present as a monolayer; however, this is an experimentally measured parameter and a value can be obtained irrespective of the precise form of the material under study. The disappearance cross section has practical significance and might or might not be simply related to the damage cross section.
Source:
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)