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- Onnattu D Jayakumar
  
  Articles written in Journal of Chemical Sciences
- Volume 113 Issue 2 April 2001 pp 129-138
  
  Multiphoton dissociation/ionisation of dimethyl sulphide (CH₃SCH₃) at 355 and 532 nm
  
  Rajesh K Vatsa Chiranjib Majumder Onnattu D Jayakumar Shailendra K Kulshreshtha Jai P Mittal
  
  More Details Abstract Fulltext PDF
  
  Multiphoton dissociation/ionization has been studied for CH₃SCH₃ at 355 and 532 nm using a time-of-flight mass spectrometer. The major ion signals observed at 355 nm are C⁺, CH₃⁺, HCS⁺, CH₂S⁺, CH₃S⁺ and CH₃SCH₃⁺. Power dependence studies at 355 nm show a (2+1) REMPI process for the formation of parent ion. Peaks atm/e = 46, 47 and 61 show two-photon laser power dependence whereasm/e = 15 and 45 peaks show four-photon dependence. However, in 532 nm photo-ionisation, no parent ion signal is observed. A peak atm/e = 35 corresponding to SH₃⁺ has been observed. SH₃⁺ has been suggested to originate from CH₃SCH₂⁺ via a cyclic transition state. Photoionisation results of CH₃SCH₃ have been compared with those of CH₃SSCH₃, at these two wavelengths.

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