Accretion Product Formation from Self- and Cross-Reactions of RO2 Radicals in the Atmosphere

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http://hdl.handle.net/10138/325745

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Berndt , T , Scholz , W , Mentler , B , Fischer , L , Herrmann , H , Kulmala , M & Hansel , A 2018 , ' Accretion Product Formation from Self- and Cross-Reactions of RO2 Radicals in the Atmosphere ' , Angewandte Chemie (International Edition) , vol. 57 , no. 14 , pp. 3820-3824 . https://doi.org/10.1002/anie.201710989

Title: Accretion Product Formation from Self- and Cross-Reactions of RO2 Radicals in the Atmosphere
Author: Berndt, Torsten; Scholz, Wiebke; Mentler, Bernhard; Fischer, Lukas; Herrmann, Hartmut; Kulmala, Markku; Hansel, Armin
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2018-03-26
Language: eng
Number of pages: 5
Belongs to series: Angewandte Chemie (International Edition)
ISSN: 1433-7851
URI: http://hdl.handle.net/10138/325745
Abstract: Hydrocarbons are emitted into the Earth's atmosphere in very large quantities by human and biogenic activities. Their atmospheric oxidation processes almost exclusively yield RO2 radicals as reactive intermediates whose atmospheric fate is not yet fully unraveled. Herein, we show that gas-phase reactions of two RO2 radicals produce accretion products composed of the carbon backbone of both reactants. The rates for accretion product formation are very high for RO2 radicals bearing functional groups, competing with those of the corresponding reactions with NO and HO2. This pathway, which has not yet been considered in the modelling of atmospheric processes, can be important, or even dominant, for the fate of RO2 radicals in all areas of the atmosphere. Moreover, the vapor pressure of the formed accretion products can be remarkably low, characterizing them as an effective source for the secondary organic aerosol.
Subject: accretion products
atmospheric chemistry
mass spectrometry
radical reactions
SECONDARY ORGANIC AEROSOL
GAS-PHASE OZONOLYSIS
PEROXY-RADICALS
OXIDATION
KINETICS
AIR
AUTOXIDATION
PHOTOLYSIS
MECHANISM
YIELDS
116 Chemical sciences
114 Physical sciences
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