Direct detection of OH formation in the reactions of HO2 with CH3C(O)O2 and other substituted peroxy radicals

T.J. Dillon, J.N. Crowley

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This work details the first direct observation of OH as a product from (R1): HO+CHC(O)O→(products), which has generally been considered an atmospheric radical termination process. The technique of pulsed laser photolysis radical generation, coupled to calibrated laser induced fluorescence detection was used to measure an OH product yield for (R1) of α(298K)=(0.5±0.2). This study of (R1) included the measurement of a rate coefficient k(298 K)=(1.4±0.5) × 10cm molecule s, substantially reducing the uncertainties in modelling this important atmospheric reaction. OH was also detected as a product from the reactions of HO with three other carbonyl-containing peroxy radicals, albeit at smaller yield, e.g. (R2): HO+CHC(O)CHO →(products), α0.15. By contrast, OH was not observed (α
Original languageEnglish
Pages (from-to)4877-4889
Number of pages13
JournalAtmospheric Chemistry and Physics
Issue number16
Publication statusPublished - 5 Aug 2008

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