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| Titel |
Analysis of high mass resolution PTR-TOF mass spectra from 1,3,5-trimethylbenzene (TMB) environmental chamber experiments |
| VerfasserIn |
M. Müller, M. Graus, A. Wisthaler, A. Hansel, A. Metzger, J. Dommen, U. Baltensperger |
| 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. 2 ; Nr. 12, no. 2 (2012-01-18), S.829-843 |
| Datensatznummer |
250010533
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| Publikation (Nr.) |
 copernicus.org/acp-12-829-2012.pdf |
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| Zusammenfassung |
| A series of 1,3,5-trimethylbenzene (TMB) photo-oxidation experiments was
performed in the 27-m3 Paul Scherrer Institute environmental chamber
under various NOx conditions. A University of Innsbruck prototype high
resolution Proton Transfer Reaction Time-of-Flight Mass Spectrometer
(PTR-TOF) was used for measurements of gas and particulate phase organics.
The gas phase mass spectrum displayed ~200 ion signals during the TMB
photo-oxidation experiments. Molecular formulas CmHnNoOp
were determined and ion signals were separated and grouped according to
their C, O and N numbers. This allowed to determine the time evolution of
the O:C ratio and of the average carbon oxidation state
OSC of the reaction mixture. Both quantities were compared with master
chemical mechanism (MCMv3.1) simulations. The O:C ratio in the particle
phase was about twice the O:C ratio in the gas phase. Average carbon
oxidation states of secondary organic aerosol (SOA) samples
OSCSOA were in the range of −0.34 to −0.31, in agreement with
expected average carbon oxidation states of fresh SOA (OSC = −0.5–0). |
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