Multiphoton dissociation/ionisation of dimethyl sulfide

Vatsa, R. K. ; Majumder, C. ; Jayakumar, O. D. ; Sharma, P. ; Kulshreshtha, S. K. ; Mittal, J. P. (2001) Multiphoton dissociation/ionisation of dimethyl sulfide Rapid Communications in Mass Spectrometry, 15 (20). pp. 1941-1946. ISSN 0951-4198

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/rcm.464...

Related URL: http://dx.doi.org/10.1002/rcm.464

Abstract

Multiphoton 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.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons, Inc.
ID Code:25779
Deposited On:04 Dec 2010 11:41
Last Modified:07 Jun 2011 06:31

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