Journal of Physical Chemistry p. 6470 - 6475 (1986)
Update date:2022-08-11
Topics:
Green, Martina
Lee, Edward K. C.
The photooxidation product distributions observed in photolyses of H2CO and H2CO*SO2 molecular complexes in O2 matrices at λ = 270-420 nm are compared.Photodissociation of H2CO produces RO2 species, i.e., HO2 and HC(O)OO radicals, which then efficiently oxidize SO2 to SO3 (and H2SO4).This process occurs with an efficiency of ca. 0.7 +/- 0.3 per H2CO*SO2 molecular complex photodissociated.Various photooxidation mechanisms are considered.Implications of the low-temperature/matrix photooxidation results on atmospheric photooxidation of SO2 by RO2 species are discussed.
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