g index

in G-SIMS
https://doi.org/10.1351/goldbook.09402
Power for the ratio of mass intensities in two mass spectra measured for two different primary ion conditions, used to generate the G-SIMS spectrum.
Notes:
  1. The different primary ion conditions can be two, well-separated, energies for the same primary ion or two different primary ions, usually at the same beam energy.
  2. A value of 13 has been found to be effective for the g index in generating G-SIMS spectra and a continuous variation between 0 and 40 for analysis.
Source:
PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1839 (https://doi.org/10.1515/pac-2019-0404)