fixed precursor ion spectrum

https://doi.org/10.1351/goldbook.12414
Spectrum obtained when data are acquired that determine the m/z values of product ions produced by the reaction of a selected precursor ion with a user-specified m/z value.
Source:
PAC, 2013, 85, 1515. (Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)) on page 1544 [Terms] [Paper]