Absolute Rate of the Reaction H+H2S

Flash photolysis coupled with resonance fluorescence of Lyman‐α radiation at 121.6 nm has been used to investigate the rate of reaction of H atoms with H2S over the temperature range 190–464°K. Conditions were chosen under which atom–radical and radical–radical reactions were unimportant and only the H‐atom–H2S reaction occurred. The rate constant thus obtained can be expressed as k1 = (1.29 ± 0.15) × 10−11exp[− (1709 ± 60) / 1.987T] cm3molecule−1·sec−1. Comparison of the Arrhenius A factor with that predicted by entropy considerations suggests a somewhat loose activated complex, but not as loose as expected on the basis of the exothermicity of the H+H2S reaction.

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