Abstract

Time-of-flight and laser-induced fluorescence methods have been employed to study the rotational relaxation of SO2 by various gases from measurement of the terminal translational and rotational temperatures for SO2 in various seeded supersonic molecular beams. Rotational collision numbers for the relaxation of SO2 by various gases have been obtained for the first time; the only previous determination was for rotational self-relaxation of SO2 by thermal conductivity measurements. It is found that in all cases the efficiency of rotational relaxation increases with increasing temperature.

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