Abstract
The positive secondary ion mass spectra of sulfonium and iodonium salts contain the intact cation as the base peaks. For the sulfonium salts, the few fragment ions are usually of less than 10% relative abundance. No fragmentation of the intact cations of the iodonium salts is observed. Glycerol and triethanolamine are both useful as solvent matrices for these analyses. The similarity in spectra obtained from these two solvents indicate that the direct sputtering of preformed ions is independent of the acid/base nature of the solvent. However, time-dependent, beam-induced products are observed in the spectra of two of the sulfonium salts dissolved in triethanolamine. The use of two solvents is required when an overlap between sample peaks and those from the solvent is present.
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