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 language | English (US) |
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Pages (from-to) | 23-37 |
Number of pages | 15 |
Journal | Journal of Atmospheric Chemistry |
Volume | 24 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1 1996 |
Keywords
- Dimethylsulfoxide
- Hydroxyl radical
- Kinetics
- Sulfur cycle
ASJC Scopus subject areas
- Environmental Chemistry
- Atmospheric Science