Multiphoton dissociation/ionization has been studied for CH3SCH3 at 355 and
532 nm using a time-of-flight mass spectrometer. The major ion signals obs
erved at 355 nm are C+, CH3+, HCS+, CH2S+, CH3S+ and CH3SCH3+. Power depend
ence studies at 355 nm show a (2 + 1) REMPI process for the formation of pa
rent ion. Peaks at mle = 46, 47 and 61 show two-photon laser power dependen
ce whereas mle = 15 and 45 peaks show four-photon dependence. However, in 5
32 nm photoionisation, no parent ion signal is observed. A peak at mle = 35
corresponding to SH3+ has been observed. SH3+ has been suggested to origin
ate from CH3SCH2+ via a cyclic transition state. Photoionisation results of
CH3SCH3 have been compared with those of CH3SSCH3 at these two wavelengths
.