The atmospheric chemistry of dimethylsulfoxide (DMSO) kinetics and mechanism of the OH + DMSO reaction

A. J. Hynes, P. H. Wine

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

We have employed a pulsed laser photolysis-pulsed laser induced fluorescence technique to study the kinetics and mechanism of the reaction of OH with dimethylsulfoxide and its deuterated analogue. A rate coefficient of (1.0 ± 0.3) x 10-10 cm3 molecule-1 s-1 was obtained at room temperature. The rate coefficient was independent of pressure over the range 25-700 Torr, showed no dependence on the nature of the buffer gas and showed no kinetic isotope effect. A limited study of the temperature dependence indicated that the reaction displays a negative activation energy. The gas phase ultraviolet absorption spectrum was obtained at room temperature and showed a strong absorption feature in the far ultraviolet. The absolute absorption cross-section at 205 nm, the absorption peak, is (1.0 ± 0.3) x 10--17 cm2, where the large uncertainty results from experimental difficulties associated with the low vapor pressure and 'stickiness' of DMSO.

Original languageEnglish (US)
Pages (from-to)23-37
Number of pages15
JournalJournal of Atmospheric Chemistry
Volume24
Issue number1
DOIs
StatePublished - Jan 1 1996

Keywords

  • Dimethylsulfoxide
  • Hydroxyl radical
  • Kinetics
  • Sulfur cycle

ASJC Scopus subject areas

  • Environmental Chemistry
  • Atmospheric Science

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