An FTIR study of the mechanism for the reaction HO + CH3SCH3

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Abstract
Product studies were made using the Fourier transform infrared method in the uv (300–400‐nm) photolysis of mixtures containing CH3SCH3, C2H5ONO, and NO in ppm concentrations in 700 torr of O2–N2 diluent. Methyl thionitrite, CH3SNO, arising from the reaction CH3S + NO, was detected as an intermediate product. In addition, the yields of the major sulfur‐containing products SO2 and CH3SO3H coincided with those of the oxidation of the CH3S radicals generated directly by the photodissociation of CH3SNO. The formation of CH3S in the HO‐initiated oxidation of CH3SCH3 in the presence of NO suggests a reaction scheme involving the H‐abstraction reaction HO + CH3SCH3 → CH3SCH2 + H2O as the primary step.