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| Titel |
Acid-yield measurements of the gas-phase ozonolysis of ethene as a function of humidity using Chemical Ionisation Mass Spectrometry (CIMS) |
| VerfasserIn |
K. E. Leather, M. R. Mcgillen, M. C. Cooke, S. R. Utembe, A. T. Archibald, M. E. Jenkin, R. G. Derwent, D. E. Shallcross, C. J. Percival |
| 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 ; 12, no. 1 ; Nr. 12, no. 1 (2012-01-09), S.469-479 |
| Datensatznummer |
250010446
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| Publikation (Nr.) |
 copernicus.org/acp-12-469-2012.pdf |
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| Zusammenfassung |
| Gas-phase ethene ozonolysis experiments were conducted at room temperature to
determine formic acid yields as a function of relative humidity (RH) using
the integrated EXTreme RAnge chamber-Chemical Ionisation Mass Spectrometry
technique, employing a CH3I ionisation scheme. RHs studied were <1,
11, 21, 27, 30 % and formic acid yields of (0.07±0.01) and
(0.41±0.07) were determined at <1 % RH and 30 % RH
respectively, showing a strong water dependence. It has been possible to
estimate the ratio of the rate coefficient for the reaction of the Criegee
biradical, CH2OO with water compared with decomposition. This analysis
suggests that the rate of reaction with water ranges between
1×10−12–1×10−15 cm3 molecule−1 s−1
and will therefore dominate its loss with respect to bimolecular processes in
the atmosphere. Global model integrations suggest that this reaction between
CH2OO and water may dominate the production of HC(O)OH in the
atmosphere. |
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