Measurement of the rate constants for the reactions of the IO. radical with sulfur-containing compounds H2S, (CH3)2S, and SO2

Reactions of iodine monooxide (IO.) with sulfur-containing compounds playing an important role in atmosphere chemistry were investigated. Effort was made to discriminate heterogeneous and homogeneous ways of the reactions based on obtained data. Constants of rates of the iodine monooxide (IO.) reaction with H2S, (CH3)2S and SO2 leading to formation of atomic iodine, which concentration was determined by atom resonance fluorescence, were taken to be measured. It is established that constants of gaseous reaction rates of (IO.) with (CH3)2S and H2S is less, than 2.5 x 10 -14 and 8.0 x 10-14 cm3 molecule-1c-1, accordingly, and constants of gaseous reaction rate of iodine monooxide with SO2 is ≤ 5.6 x 10-15 cm3 molecule-1c-1