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The HO 2  radical yield in the OH initiated oxidation of SO 2  has been determined by direct observation of HO 2  concentration time profiles following the 248 nm photolysis of H 2 O 2 /SO 2 /O 2  mixtures. Initial OH radical concentrations have been deduced from a fit of the absolute HO 2  concentration time profiles after 248 nm photolysis of H 2 O 2  in the absence of SO 2 , an increase in the HO 2  concentration upon addition of SO 2  to this reaction mixture is observed and can be explained by a decrease of HO  x  -radical losses due to a faster decay of OH radicals in the presence of SO 2 . Simulations of theses profiles using recommended rate constants in a simple model are in agreement with an HO 2 -yield of 1.0 ± 0.1 from the OH initiated oxidation of SO 2 .

Yield of HO 2 Radicals in the OH-Initiated Oxidation of SO 2