Rate constants for the reaction of OH radicals with COS, CS2 and CH3SCH3 over the temperature range 299–430 K

Abstract Rate constants for the reaction of OH radicals with COS, CS 2 and CH 3 SCH 3 , which are involved in the global sulfur cycle, have been determined over the temperature range 299–430 K using a flash photolysis-resonance fluorescence technique. For COs and CS 2 upper limits at room temperature of k (COS) −15 cm 3 molecule −1 s −1 and k (CS 2 ) −14 cm 3 molecule −1 s −1 were determined, while for CH 3 SCH 3 the Arrhenius expression k (CH 3 SCH 3 ) = 5.47 × 10 −12 exp[(355 ± 300)/ RT ] cm 3 molecule −1 s −1 was obtained with a rate constant at room temperature of (9.8 ± 1.2) × 10 −12 cm 3 molecule −1 s −1 .

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