Abstract
The dissociation of SO2 in mixtures with Kr was investigated in incident shock waves over the temperature range 2900−5200 K. The rate of the low−pressure unimolecular dissociation was determined with a laser−beam deflection technique. Vibrational relaxation of the SO2 was unresolved and initial rates were estimated by extrapolation to the shock front. Arrhenius parameters obtained for the rate coefficient in SO2−Kr collisions are logA = 16.23 (A in cm3/mole⋅s), and an activation energy Ea = 112±4 kcal/mole. The rate coefficient for SO2−SO2 collisions is roughly a factor of 3.4 larger. These results fit well with recombination measurements and agree adequately with some previous shock tube data. However, they are in serious disagreement with the shock tube measurements of Olschewski, Troe, and Wagner [Z. Phys. Chem. 44, 173 (1965)].
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