post-source decay

initialism: PSD
https://doi.org/10.1351/goldbook.12530
Technique specific to reflectron time-of-flight mass spectrometers where product ions of metastable transitions or collision-induced dissociations generated in the flight tube prior to entering the reflectron are separated according to m/z to yield product ion spectra.
Source:
PAC, 2013, 85, 1515. (Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)) on page 1578 [Terms] [Paper]