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

Anthony J Hynes, P. H. Wine

Research output: Contribution to journalArticle

60 Citations (Scopus)

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
StatePublished - 1996

Fingerprint

Atmospheric chemistry
atmospheric chemistry
Dimethyl Sulfoxide
Pulsed lasers
kinetics
Kinetics
Gases
laser induced fluorescence
temperature
Photolysis
absorption spectrum
photolysis
Vapor pressure
vapor pressure
gas
Isotopes
activation energy
Temperature
low pressure
Absorption spectra

Keywords

  • Dimethylsulfoxide
  • Hydroxyl radical
  • Kinetics
  • Sulfur cycle

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Environmental Chemistry
  • Earth and Planetary Sciences(all)

Cite this

The atmospheric chemistry of dimethylsulfoxide (DMSO) kinetics and mechanism of the OH + DMSO reaction. / Hynes, Anthony J; Wine, P. H.

In: Journal of Atmospheric Chemistry, Vol. 24, No. 1, 1996, p. 23-37.

Research output: Contribution to journalArticle

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