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| Titel |
A product study of the isoprene+NO3 reaction |
| VerfasserIn |
A. E. Perring, A. Wisthaler, M. Graus, P. J. Wooldridge, A. L. Lockwood, L. H. Mielke, P. B. Shepson, A. Hansel, R. C. Cohen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 14 ; Nr. 9, no. 14 (2009-07-24), S.4945-4956 |
| Datensatznummer |
250007525
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| Publikation (Nr.) |
 copernicus.org/acp-9-4945-2009.pdf |
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| Zusammenfassung |
| Oxidation of isoprene through reaction with NO3 radicals is a
significant sink for isoprene that persists after dark. The main products of
the reaction are multifunctional nitrates. These nitrates constitute a
significant NOx sink in the nocturnal boundary layer and they likely
play an important role in formation of secondary organic aerosol. Products
of the isoprene+NO3 reaction will, in many locations, be abundant
enough to affect nighttime radical chemistry and to persist into daytime
where they may represent a source of NOx. Product formation in the
isoprene + NO3 reaction was studied in a smog chamber at Purdue
University. Isoprene nitrates and other hydrocarbon products were observed
using Proton Transfer Reaction-Mass Spectrometry (PTR-MS) and reactive
nitrogen products were observed using Thermal Dissociation–Laser Induced
Fluorescence (TD-LIF). The organic nitrate yield is found to be 65±12% of which the majority was nitrooxy carbonyls and the combined yield
of methacrolein and methyl vinyl ketone (MACR+MVK) is found to be
∼10%. PTR-MS measurements of nitrooxy carbonyls and TD-LIF measurements
of total organic nitrates agreed well. The PTR-MS also observed a series of
minor oxidation products which were tentatively identified and their yields
quantified These other oxidation products are used as additional constraints
on the reaction mechanism. |
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