Absolute rate parameters for the reaction of atomic hydrogen with carbonyl sulfide and ethylene episulfide

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Abstract
Absolute rate constants for the reaction of atomic hydrogen with carbonyl sulfide H+OCS→SH+CO (1) and ethylene episulfide H+C2H4S→SH+C2H4 (2) have been determined using the flash photolysis–resonance fluorescence technique. Under conditions where secondary reactions are avoided, rate constants for the carbonyl sulfide reaction over the temperature range 261 to 500 K gave the Arrhenius expression k1= (9.06±1.53) ×10−12 exp(−3850±110/1.987T) cm3 molecule−1 s−1. The corresponding Arrhenius expression for the ethylene episulfide reaction over the temperature range 223 to 423 K is k2= (2.87±0.12) ×10−11 exp(−1880±24/1.987T) cm3 molecule−1 s−1. These results are discussed, comparisons made with previous work, and implications considered for a model of the sulfuric acid aerosol clouds on the planet Venus.