Articles | Volume 15, issue 8
https://doi.org/10.5194/acp-15-4145-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Special issue:
https://doi.org/10.5194/acp-15-4145-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
22 Apr 2015
Research article |
| 22 Apr 2015
Elemental composition and clustering behaviour of α-pinene oxidation products for different oxidation conditions
A. P. Praplan
CORRESPONDING AUTHOR
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
S. Schobesberger
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
now at: University of Washington, Department of Atmospheric Sciences, Box 351640, Seattle, WA 98195, USA
F. Bianchi
Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
Institute for Atmospheric and Climate Science, ETH Zurich, 8092 Zurich, Switzerland
M. P. Rissanen
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
T. Jokinen
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
H. Junninen
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
A. Adamov
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
A. Amorim
Laboratory for Systems, Instrumentation, and Modeling in Science and Technology for Space and the Environment (SIM), University of Lisbon and University of Beira Interior, 1749-016 Lisbon, Portugal
J. Dommen
Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
J. Duplissy
Helsinki Institute of Physics, University of Helsinki, Helsinki, Finland
J. Hakala
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
A. Hansel
University of Innsbruck, Institute for Ion Physics and Applied Physics, Technikerstrasse 25, 6020 Innsbruck, Austria
Ionicon Analytik, Eduard Bodem Gasse 3, 6020 Innsbruck, Austria
M. Heinritzi
University of Innsbruck, Institute for Ion Physics and Applied Physics, Technikerstrasse 25, 6020 Innsbruck, Austria
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
J. Kangasluoma
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
J. Kirkby
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
CERN, CH1211, Geneva, Switzerland
M. Krapf
Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
A. Kürten
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
K. Lehtipalo
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
F. Riccobono
Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
L. Rondo
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
N. Sarnela
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
A. Tomé
Laboratory for Systems, Instrumentation, and Modeling in Science and Technology for Space and the Environment (SIM), University of Lisbon and University of Beira Interior, 1749-016 Lisbon, Portugal
J. Tröstl
Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
P. M. Winkler
Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria
C. Williamson
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
P. Ye
Center for Atmospheric Particle Studies, Carnegie Mellon University, 5000 Frobes Ave, Pittsburgh, PA 15213, USA
J. Curtius
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
U. Baltensperger
Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
N. M. Donahue
Center for Atmospheric Particle Studies, Carnegie Mellon University, 5000 Frobes Ave, Pittsburgh, PA 15213, USA
M. Kulmala
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
Helsinki Institute of Physics, University of Helsinki, Helsinki, Finland
D. R. Worsnop
Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
Aerodyne Research Incorporated, Billerica, MA 01821, USA
Abstract. 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.
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How to cite. Praplan, A. P., Schobesberger, S., Bianchi, F., Rissanen, M. P., Ehn, M., Jokinen, T., Junninen, H., Adamov, A., Amorim, A., Dommen, J., Duplissy, J., Hakala, J., Hansel, A., Heinritzi, M., Kangasluoma, J., Kirkby, J., Krapf, M., Kürten, A., Lehtipalo, K., Riccobono, F., Rondo, L., Sarnela, N., Simon, M., Tomé, A., Tröstl, J., Winkler, P. M., Williamson, C., Ye, P., Curtius, J., Baltensperger, U., Donahue, N. M., Kulmala, M., and Worsnop, D. R.: Elemental composition and clustering behaviour of α-pinene oxidation products for different oxidation conditions, Atmos. Chem. Phys., 15, 4145–4159, https://doi.org/10.5194/acp-15-4145-2015, 2015.
Short summary
Our study shows, based on data from three atmospheric pressure interface time-of-flight mass spectrometers measuring in parallel charged and neutral molecules and molecular clusters, how oxidised organic compounds bind to inorganic ions (e.g. bisulfate, nitrate, ammonium). This ionisation is selective for compounds with lower molar mass due to their limited amount and variety of functional groups. We also found that extremely low volatile organic compounds (ELVOCs) can be formed immediately.
Our study shows, based on data from three atmospheric pressure interface time-of-flight mass...
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