Abstract
The reactions of methane and methanol species with excited atomic oxygen generated by ozone have been examined in low temperature argon matrices. The major product of the CH 4+O( 1D) reaction was CH 3OH, confirming a previous prediction of the intermediary of CH 3OH to the first product in the gas phase reaction. Insertion of an O atom in a CH or CD bond was found to give a similar result. On the basis of kinetic studies two major pathways were observed for the CH 3OH+O( 1D) reaction. The first one led to H 2O and CH 2O and the second one to methanediol by insertion of an O atom in a CH bond. H 2O and CH 2O arise from an intermediate not isolated. Experiments with oxygen-18 and deuterated methanol suggest either an abstraction of a hydroxyl H atom by O( 1D) or an insertion of atomic oxygen in the OH bond. A weak complex between methanol and ozone was identified, but it did not play a particular role in the reaction.
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