Rate constant for the reaction OH + H₂S in the range 243–463 K by discharge-flow laser-induced fluorescence

Abstract

The absolute rate constant k1 of the reaction of OH with H2S has been measured in helium in the range 243–363 K by discharge-flow laser-induced fluorescence. A few measurements have also been performed with the same flow tube by resonance fluorescence in the range 294–463 K. The parabolic behaviour of k1vs. temperature, with a minimum value of (33 ± 5)× 10–13 cm3 molecule–1 s–1 at 294 K, is confirmed. Our data above 294 K can be fitted with an Arrhenius form: k1= 1.32 × 10–11 exp [–(394 + 190)/T] cm3 molecule–1 s–1.