Abstract
AbstractMultiphoton dissociation/ionisation studies have been carried out at 355 nm for dimethyl disulfide (CH3SSCH3) using a time‐of‐flight‐mass spectrometer. The prominent ion signals observed are CH3+, S+, HCS+ and S2+. No evidence for the formation of a parent ion signal was observed. The laser power variation experiments show a two‐photon dependence for the most prominent HCS+ ion. The presence of a signal at m/e 30 is explained in terms of concerted elimination of ethane from the excited neutral CH3SSCH3 via a cyclic transition state. It is inferred that the multiphoton dissociation of CH3SSCH3 at 355 nm involves both S‐S and C‐S bond cleavage. Based on these results, it has been suggested that CH3S+ isomerises to CH2SH+, which undergoes unimolecular decay to produce HCS+ by H2 elimination. The results have been interpreted in terms of the dissociation of the parent molecule using two photons, followed by the ionisation of the fragments. Copyright © 2001 John Wiley & Sons, Ltd.
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