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This work details the first direct observation of OH as a product from (R1):HO2+CH3C(O)O2→(products), which has generally beenconsidered an atmospheric radical termination process. The technique ofpulsed laser photolysis radical generation, coupled to calibrated laserinduced fluorescence detection was used to measure an OH product yield for(R1) of α1(298 K)=(0.5±0.2). This study of (R1)included the measurement of a rate coefficient k1(298 K)=(1.4±0.5)×10−11cm3 molecule−1 s−1, substantiallyreducing the uncertainties in modelling this important atmospheric reaction.OH was also detected as a product from the reactions of HO2 with threeother carbonyl-containing peroxy radicals, albeit at smaller yield, e.g. (R2):HO2+CH3C(O)CH2O2→(products), α2≈0.15. By contrast, OH was not observed (α<0.06)as a major product from reactions where carbonyl functionality was absent,e.g. HO2+HOCH2CH2O2 (R8), and HO2+CH3CH(OH)CH2O2 (R9)

atmospheric chemistry and physics

Direct detection of OH formation in the reactions of HO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; with CH&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;C(O)O&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and other substituted peroxy radicals