selected ion monitoring

in mass spectrometry
https://doi.org/10.1351/goldbook.S05547
This term is used to describe the operation of the @M03732@ in which the intensities of several specific ion beams are recorded rather than the entire @M03749@. An alternative recommended term is multiple ion (peak) @MT06831@. The use of the terms multiple ion detection and mass fragmentography are not recommended, because in the case of the former, it is the @MT06831@ of several peaks which should be emphasized rather than the detection of different ions, and in the case of the latter it is often not fragments that are being monitored but peaks from molecular ions.
Source:
PAC, 1991, 63, 1541. (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1551 [Terms] [Paper]