A Shock Tube Study of the Reactions of H Atoms with COS, CS 2 , and H 2 S

Reactions of H atoms with COS, CS 2 , and H 2 S were studied behind reflected shock waves at temperatures between 1170 K and 1830 K and pressures around 1.0 bar by applying atomic resonance absorption spectroscopy (ARAS) for time‐resolved measurements of H atoms at L α . The thermal decomposition of a few ppm ethyl iodide (C 2 H 5 I) was used as a H‐atom source. In the presence of a large excess of the molecular reactant COS, CS 2 , or H 2 S, a consumption of H was observed which follows a pseudo first‐order rate law. Rate coefficients for the reactions:were determined to be: k 1 = 2.4 × 10 14 exp(–3415 K/ T ) cm 3 mol −1 s −1 k 2 = 1.4 × 10 15 exp(–9250 K/ T ) cm 3 mol −1 s −1 k 3 = 2.5 × 10 14 exp(–2890 K/ T ) cm 3 mol −1 s −1