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Photooxidation of carbonyl sulfide (SCO) in the presence of ozone has been studied in solid matrices under stratospheric irradiation conditions. The matrix experiments allowed the isolation and identification of SCO ' 0 , 1 : 1 aggregates. Selective photolysis of O3 yielded O('D) atoms and subsequent reaction with SCO resulted in the primary formation of C 0 2 + S. The sulfur atoms generated this way are oxidized to SO? by 02, which has been formed during photofragmentation of 03. In further steps SO2 reacted with diffusing 0 atoms to SO3 and SO4. Experiments with isotopically labeled precursors confirmed the conclusions that the photolysis of "0,. SCO hetero-complexes leads to SlSO2, S1803, and '60C'80 formation.

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