Rate of reaction of OH with COS

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Abstract
The laser/flash photolysis‐resonance fluorescence technique was employed to study the kinetics of the reaction OH + COS →k1 products. Complicating secondary reactions involving COS photofragments were eliminated by using 193 nm laser photolysis of HNO3 as a source of OH. The rate constant was found to be much slower than previous measurements indicated. Based on our experiments, the upper limit for k1 at 298K is 8.8 × 10−15 cm³molecule−1s−1. Our results suggest that the title reaction is only a minor COS degradation pathway in the troposphere.