The Combustion of Gaseous Methyl Iodide Studied by Flash Photolysis and Kinetic Spectroscopy

Physics

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Scientific paper

The combustion of gaseous methyl iodide has been studied under conditions of slow and explosive combustion and the behaviour of the methyl iodide, the free radicals OH and IO and the products formaldehyde and iodine has been followed by kinetic spectroscopy. At fairly low pressures (1.0 to 5.5 cm Hg) the behaviour of the methyl iodide and the OH radicals under conditions of slow and explosive combustion indicates that the reaction between methyl radicals and oxygen proceeds by CH_3+O_2 --> H_2CO + OH. At higher pressures, under slow combustion conditions, formaldehyde is detectable in the gas phase by reaction between methyl radicals and oxygen. Under slow combustion conditions also, the behaviour of the IO radicals and iodine suggests that the iodine atoms produced by the primary photolytic dissociation of methyl iodide are temporarily removed in the form of IO radicals, from which the final product iodine is then formed by 2IO --> I_2 + O_2.

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