Abstract
The recombination reaction O + SO + M ..-->.. SO/sub 2/ + M has been studied at room temperature by laser flash photolysis in a variety of 13 bath gases M. By variation of the pressure between 0.2 and 200 bar, major parts of the falloff curves were observed. A liming high-pressure rate coefficient of k/sub rec,infinity//(Ar) = 5.3 x 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/ and limiting low-pressure rate coefficients of k/sub rec,0/(Ar) = 5.1 x 10/sup -31/ cm/sup 6/ molecule/sup -2/s/sup -1/ and k/sub rec,0//(N/sub 2/) = 7.7 x 10/sup -31/ cm/sup 6/ molecule/sup -2/s/sup -1/ were obtained. A theoretical analysis of these data and SO/sub 2/ dissociation results suggests that excited electronic states of SO/sub 2/ contribute with a factor of 5-20 to the low- and high-pressure ranges of the reaction. Average energies transferred per collision are derived from the low-pressure rate coefficients. For M = Ar, probably does not markedly depend on the temperature between 300 and 5000 k. The indirectly derived values from this work correspond to recently directly measured values after laser excitation. 57 references, 3 figures, 5 tables.
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