 |
| Titel |
Elemental composition and clustering behaviour of α-pinene oxidation products for different oxidation conditions |
| VerfasserIn |
A. P. Praplan, S. Schobesberger, F. Bianchi, M. P. Rissanen, M. Ehn, T. Jokinen, H. Junninen, A. Adamov, A. Amorim, J. Dommen, J. Duplissy, J. Hakala, A. Hansel, M. Heinritzi, J. Kangasluoma, J. Kirkby, M. Krapf, A. Kürten, K. Lehtipalo, F. Riccobono, L. Rondo, N. Sarnela, M. Simon, A. Tomé, J. Tröstl, P. M. Winkler, C. Williamson, P. Ye, J. Curtius, U. Baltensperger, N. M. Donahue, M. Kulmala  , D. R. Worsnop |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 8 ; Nr. 15, no. 8 (2015-04-22), S.4145-4159 |
| Datensatznummer |
250119657
|
| Publikation (Nr.) |
 copernicus.org/acp-15-4145-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
This study presents the difference between oxidised organic compounds
formed by α-pinene oxidation under various conditions in the
CLOUD environmental chamber: (1) pure ozonolysis (in the presence of
hydrogen as hydroxyl radical (OH) scavenger) and (2) OH oxidation
(initiated by nitrous acid (HONO) photolysis by ultraviolet light) in
the absence of ozone.
We discuss results from three Atmospheric Pressure interface Time-of-Flight
(APi-TOF) mass spectrometers measuring simultaneously the composition
of naturally charged as well as neutral species (via chemical ionisation
with nitrate). Natural chemical ionisation takes place in
the CLOUD chamber and organic oxidised compounds form clusters with
nitrate, bisulfate, bisulfate/sulfuric acid clusters, ammonium, and
dimethylaminium, or get protonated. The results from this study show that
this process is selective for various oxidised organic compounds with low molar mass and ions,
so that in order to obtain a comprehensive picture of the elemental composition
of oxidation products and their clustering behaviour, several instruments must
be used. We compare oxidation products containing 10 and 20 carbon
atoms and show that highly oxidised organic compounds are formed in the early
stages of the oxidation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|