precursor ion

in mass spectrometry
https://doi.org/10.1351/goldbook.P04807
Synonymous with @P04406@.
Sources:
Orange Book, 2nd ed., p. 205 [Terms]
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 1549 [Terms] [Paper]