liquid secondary ionization

initialism: LSI
https://doi.org/10.1351/goldbook.12469
Ionization of any species by the interaction of a focused beam of ions or atoms with a sample that is dissolved in a solvent matrix.
Source:
PAC, 2013, 85, 1515. (Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)) on page 1561 [Terms] [Paper]