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

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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 , Tome , A , Tröstl , J , Winkler , P M , Williamson , C , Ye , P , Curtius , J , Baltensperger , U , Donahue , N M , Kulmala , M & Worsnop , D R 2015 , ' Elemental composition and clustering behaviour of alpha-pinene oxidation products for different oxidation conditions ' , Atmospheric Chemistry and Physics , vol. 15 , no. 8 , pp. 4145-4159 . https://doi.org/10.5194/acp-15-4145-2015

Title: Elemental composition and clustering behaviour of alpha-pinene oxidation products for different oxidation conditions
Author: Praplan, A. P.; Schobesberger, S.; Bianchi, F.; Rissanen, M. P.; Ehn, M.; Jokinen, Tuija; 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.; Tome, A.; Tröstl, J.; Winkler, P. M.; Williamson, C.; Ye, P.; Curtius, J.; Baltensperger, U.; Donahue, N. M.; Kulmala, Markku; Worsnop, D. R.
Other contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Paul Scherrer Institute
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics


Date: 2015
Language: eng
Number of pages: 15
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
DOI: https://doi.org/10.5194/acp-15-4145-2015
URI: http://hdl.handle.net/10138/161570
Abstract: 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.
Subject: SECONDARY ORGANIC AEROSOL
CONTROLLED CHEMICAL CONDITIONS
HIGH-NOX ENVIRONMENTS
SULFURIC-ACID
PARTICLE FORMATION
MASS-SPECTROMETRY
ATMOSPHERIC CONDITIONS
BOREAL FOREST
NUCLEATION
PHOTOOXIDATION
114 Physical sciences
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