MSn

https://doi.org/10.1351/goldbook.12498
Symbol for multiple-stage mass spectrometry experiments designed to record product ion spectra where \(n\) is the number of product ion stages (nth-generation product ions).
Source:
PAC, 2013, 85, 1515. (Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)) on page 1569 [Terms] [Paper]