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1716546 
Journal Article 
Formation of hydroxymethyl hydroperoxide and formic acid in alkene ozonolysis in the presence of water vapour 
Neeb, P; Sauer, F; Horie, O; Moortgat, GK 
1997 
1 
Atmospheric Environment
ISSN: 1352-2310
EISSN: 1873-2844 
31 
10 
1417-1423 
WOS:A1997WR16000004 
Ozonolysis experiments of a series of terminal alkenes were performed to study the products formed in the presence of water vapour. Alkenes investigated were ethene, propene, isobutene and isoprene. Concentrations of the reactants were 4-6 ppmv alkene and 2 ppm ozone. The concentration of water vapour was varied from 0.5 ppmv to 17,000 ppmv. Hydroxymethyl hydroperoxide (HMHP) was found to be the sole product in the reactions of the stabilized Criegee biradical CH2OO with water vapour. The yield of HMHP relative to ozone consumption was measured to be 42% ethene, 14% propene, 13% isobutene and 30% isoprene in the presence of 9000-18,000 ppmv H2O. HMHP was not stable under the experimental conditions and decomposed to HCOOH and water, presumably via a heterogeneous process. The atmospheric fate of HMHP and the relative rate constants of the CH2OO Criegee biradical with H2O,HCOOH and NOx are discussed. (C) 1997 Elsevier Science Ltd. 
ozone-alkene reaction; hydroxymethyl hydroperoxide; isoprene; ethene; Criegee biradical CH2OO