fractional ion yield

https://doi.org/10.1351/goldbook.09401
Number of ions of a particular species sputtered from a sample divided by number of particles of that species sputtered from that sample.
Source:
PAC, 2020, 92, 1781. (Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)) on page 1839 [Terms] [Paper]