Kinetic and mechanistic studies of the OH-initiated oxidation of dimethylsulfide at low temperature - A reevaluation of the rate coefficient and branching ratio

M. B. Williams, P. Campuzano-Jost, D. Bauer, A. J. Hynes

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

The pulsed laser photolysis-pulsed laser induced fluorescence (PLP-PLIF) technique has been used to study the reactions of OH with DMS and DMS-d6. The effective rate coefficient for the reaction of OH with DMS-d6 has been determined as a function of O2 partial pressure at 600 Torr total pressure in N2/O2 mixtures at 298 and 261 K and for both DMS and DMS-d6 at 240 K. Currently recommended rates are based on an empirical fit to a two-channel mechanism. This work shows that at low temperatures the currently recommended expression underestimates both the effective rate coefficient for reaction together with the branching ratio between addition and abstraction.

Original languageEnglish (US)
Pages (from-to)61-67
Number of pages7
JournalChemical Physics Letters
Volume344
Issue number1-2
DOIs
StatePublished - Aug 17 2001

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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