Vibrational Relaxation in SO2/O2 Mixtures

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Abstract
Measurements of sound absorption due to vibrational relaxation in SO2/O2 mixtures indicate a vibration—vibration (v—v) coupling between the asymmetric stretching mode of SO2 and the vibrational mode of O2. The theory of Tanczos, modified to allow for four quantum interchanges, was used to analyze the results. The acoustic absorption measurements of 5% SO2/95% O2 and 10% SO2/90% O2 mixtures enabled a distinction to be made between the series and parallel relaxation schemes in SO2. The measurements indicate that SO2 relaxes by way of the series process with energy passing through the stretching modes into the bending mode by vibration—vibration (v—v) energy transfer. SO2/SO2 collisions are of the order of 5 times as effective as SO2/O2 collisions in producing v—v exchanges within the SO2 molecule.

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