Elemental composition and clustering behaviour of α-pinene oxidation products for different oxidation conditions

Autor(en)

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. Tome, J. Troestl, P. M. Winkler, C. Williamson, P. Ye, J. Curtius, U. Baltensperger, N. M. Donahue, M. Kulmala, D. R. Worsnop

Abstrakt

This study presents the difference between oxidised organic compounds formed by alpha-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.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

University of Helsinki, Paul Scherrer Institute, Universidade da Beira Interior, Leopold-Franzens-Universität Innsbruck, IONICON Analytik GmbH, Johann Wolfgang Goethe-Universität Frankfurt am Main, European Organization for Nuclear Research (CERN), Carnegie Mellon University, Aerodyne Res Inc, Eidgenössische Technische Hochschule Zürich, Universidade de Lisboa

Journal

Atmospheric Chemistry and Physics

Band

15

Seiten

4145-4159

Anzahl der Seiten

15

ISSN

1680-7316

DOI

https://doi.org/10.5194/acp-15-4145-2015

Publikationsdatum

04-2015

Peer-reviewed

Ja

ÖFOS 2012

103037 Umweltphysik, 103039 Aerosolphysik

Schlagwörter

ASJC Scopus Sachgebiete

Atmospheric Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5178369a-3f9f-4602-9a25-614fb365e160