Rate constant for the reaction of OH radicals with dimethyl sulfide

The rate constants of the gas phase reaction of OH radicals with dimethyl sulfide (CH₃SCH₃) over the temperature range 260–393 K have been studied using the discharge flow‐resonance fluorescence technique. The rate constants were fitted by the Arrhenius equation k = (11.8 ± 2.2) × 10⁻¹² exp[−(236 ± 150)/T] cm³ molecule⁻¹ s⁻¹ with k = (5.5 ± 1.0) × 10⁻¹² cm³ molecule⁻¹ s⁻¹ at 298 K. Our results are in good agreement with the lower range of values reported previously. The observation of a small positive activation energy agrees well with that reported by Hynes et al. The rate constant was not affected by the total pressure variation (0.8–3.0 torr) or by the addition of oxygen (up to 1 torr) in the flow tube.