Abstract
The rate constants for the H( 2S) + H 2S reaction were measured behind reflected shock waves ( T = 1053–2237 K) and at 293 K, in which H( 2S) atoms were generated by the ArF-laser photolysis of H 2S. The resulting rate constant, k = (1.96 ± 0.7) × 10 −17 T 2.1±0.3 exp[− (352 ± 84) / T] cm 3 molecule −1 s −1, showed a strong non-Arrhenius dependence on the temperature. This dependence is explained by a conventional transition-state theory combined with a quantum-mechanical calculation of the transition state at the PMP4(SDTQ)6-311G**//MP2/6-31G** level.
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