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The absorption intensities of SO2 were measured in the wavelength region 1849–3150 Å employing the hydrogen continuum as the source and at selected wavelengths utilizing the mercury line spectrum. The pressure dependence of the absorption intensity was investigated at 1849, 2537, and 3131 Å. The existence of an absorption continuum commencing at 2280 Å has been established and attributed to the dissociation of SO2 forming SO and a ground-state oxygen atom. The onset of the continuum provides an upper limit value to the dissociation energy of SO2. The implications upon the SO2 and SO dissociation energies are discussed.

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The reaction of oxygen atoms and carbonyl sulfide has been investigated in conjunction with a fast flow system. The following predominant reactions have been found to occur in the early stage, The rate constant at room temperature associated with the first reaction was determined to be k1 = 0.91 ± 0.14 · 10−14 cc/molec. sec and that of the second reaction was estimated as k5 = 4.3 · 10−12 cc/molec. sec. The implications of the chemistry of SO radicals are discussed.