Temperature dependence of the rate constant for the reaction OH + H2S in He,N2, and O2

The rate constants of the reaction between OH and H₂S in He, N₂, and O₂ over the temperature range 245–450 K have been determined using the discharge flow-resonance fluorescence technique. At 299 K, k₁ = (4.4 ± 0.7) × 10^?12 cm³ molecule^?1 s^?1. The temperature dependence of the rate constant can be fitted either by k₁ = 5.6 × 10^?12 exp(?57/T) or by k₁ = (3.8 × 10^?19)T^2.43 exp(732/T) to within 8 and 9%, respectively. However, the non-Arrhenius behavior can be confidently confirmed. The absence of the pressure dependence and the third-body effect at low temperature suggest that the complex formation mechanism is not important over the temperature range of our study.