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Does atmospheric processing of saturated hydrocarbon surfaces by NO3 lead to volatilization?

TitleDoes atmospheric processing of saturated hydrocarbon surfaces by NO3 lead to volatilization?
Publication TypeJournal Article
Year of Publication2006
AuthorsKnopf, DA, Mak, J, Gross, S, Bertram, AK
JournalGeophysical Research Letters
Volume33
Pagination5
Date PublishedSep
Type of ArticleArticle
ISBN Number0094-8276
KeywordsFILMS, GAS-PHASE PRODUCTS, HETEROGENEOUS REACTION, KINETICS, LIQUID, OLEIC-ACID, ORGANIC AEROSOLS, ozone, PARTICLES, REACTIVE UPTAKE
Abstract

The heterogeneous oxidation of a saturated hydrocarbon monolayer by NO3 was studied. A flow tube reactor coupled to chemical ionization mass spectrometry was used to determine the reactive uptake coefficient of NO3 on these surfaces, and X-ray photoelectron spectroscopy (XPS) was used to investigate surface oxidation and to determine if exposure to NO3 leads to volatilization of the organic substrate. The uptake coefficient of NO3 by an alkane monolayer is about (8.8 +/- 2.5) x 10(-4), which may lead to competitive oxidation compared with OH, due to the higher atmospheric abundance of NO3 under certain conditions. The XPS results are consistent with the formation of 1) C-O groups, 2) ketones or aldehydes, and 3) carboxylic groups. The XPS results also suggest that NO3 does not rapidly volatilize the organic surface: even under extremely polluted conditions, maximum 10% of the organic layer is volatilized.

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