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dc.contributor.authorPeeters, J.
dc.contributor.authorMüller, J.-F.
dc.date2010
dc.date.accessioned2016-03-30T12:01:17Z
dc.date.available2016-03-30T12:01:17Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/3192
dc.descriptionA consistent body of experimental evidence from work of other groups is presented in support of the novel, theoretically based, isoprene oxidation mechanism we recently proposed to rationalize the unexpectedly high OH concentrations observed over areas with high isoprene emissions. Some explicit or implicit criticisms on the new mechanism are addressed. A particular photochemical mechanism is newly proposed for the OH-regenerating photolysis of the crucial hydroperoxy-methyl-butenals (HPALDs), formed by isomerisation of the initial isoprene hydroxy-peroxy radicals, that rationalizes a quantum yield close to 1. A similar photolysis mechanism of the resulting photolabile peroxy-acid-aldehydes (PACALDs) is shown to generate ample additional OH. Global modeling demonstrates the major importance of the new chemistry for the oxidizing capacity of the atmosphere over continents. The globally averaged yield of the HPALDs in the oxidation of isoprene by OH is estimated to be of the order of 0.6. The isomerisation reactions of isoprene peroxy radicals are found to result in modelled [OH] increases in the planetary boundary layer by up to a factor of 3, in agreement with the reported observations as in the Amazon basin.
dc.languageeng
dc.titleHOx radical regeneration in isoprene oxidation via peroxy radical isomerisations. II: Experimental evidence and global impact
dc.typeArticle
dc.subject.frascatiChemical sciences
dc.audienceScientific
dc.source.titlePhysical Chemistry Chemical Physics
dc.source.volume12
dc.source.issue42
dc.source.page14227-14235
Orfeo.peerreviewedYes
dc.identifier.doi10.1039/c0cp00811g
dc.identifier.scopus2-s2.0-77954358813


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