✦ LIBER ✦

Kinetics and mechanisms of the reaction of OH radicals with dimethyl sulfide

✍ Scribed by I. Barnes; V. Bastian; K. H. Becker

Publisher: John Wiley and Sons
Year: 1988
Tongue: English
Weight: 936 KB
Volume: 20
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550200602

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✦ Synopsis

The rate constant of the reaction of OH with DMS has been measured relative to OH + ethene in a 420 1 reaction chamber a t 760 torr total pressure and 298 t 3 K in N L + 0, buffer gas using the 254 nm photolysis of H202 as the OH source. In agreement with a recent absolute rate determination of the reaction the measured effective rate constant was found to increase with increasing partial pressure of 0, in the system, for 760 torr air a rate constant of (8.0 ? 0.5) x lo-'' cm' s Product studies have been performed on the reaction in air using FTIR absorption spectrometry for detection of reactants and products. On a molar basis, SO, was formed with a yield of 70% and dimethyl sulfone (CH,S02CH,) with a yield of approximately 2O'Z. These results are considerably different to those obtained in other product studies which were carried out in the presence of NO,. These differences are compared and their relevance for the atmospheric oxidation mechanisms of DMS is discussed. was obtained.

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