Explanation of the unusual temperature dependence of the atmospherically important OH + [H.sub.2]S -> [H.sub.2]O + HS reaction and prediction of the rate constant at combustion temperatures

The rate constants for the OH + [H.sub.2]S -> [H.sub.2]O + HS reaction are calculated by direct dynamics with the M06-2X density functional theory. The rate constants are important for both atmospheric chemistry and combustion, while the temperature dependence is accounted for even in the context of a simple abstraction reaction.