Ehn , M , Berndt , T , Wildt , J & Mentel , T 2017 , ' Highly Oxygenated Molecules from Atmospheric Autoxidation of Hydrocarbons : A Prominent Challenge for Chemical Kinetics Studies ' , International Journal of Chemical Kinetics , vol. 49 , no. 11 , pp. 821-831 . https://doi.org/10.1002/kin.21130
Title: | Highly Oxygenated Molecules from Atmospheric Autoxidation of Hydrocarbons : A Prominent Challenge for Chemical Kinetics Studies |
Author: | Ehn, Mikael; Berndt, Torsten; Wildt, Juergen; Mentel, Thomas |
Contributor organization: | Department of Physics |
Date: | 2017-11 |
Language: | eng |
Number of pages: | 11 |
Belongs to series: | International Journal of Chemical Kinetics |
ISSN: | 0538-8066 |
DOI: | https://doi.org/10.1002/kin.21130 |
URI: | http://hdl.handle.net/10138/316927 |
Abstract: | Recent advances in chemical ionization mass spectrometry have allowed the detection of a new group of compounds termed highly oxygenated molecules (HOM). These are atmospheric oxidation products of volatile organic compounds (VOC) retaining most of their carbon backbone, and with O/C ratios around unity. Owing to their surprisingly high yields and low vapor pressures, the importance of HOM for aerosol formation has been easy to verify. However, the opposite can be said concerning the exact formation pathways of HOM from major aerosol precursor VOC. While the role of peroxy radical autoxidation, i.e., consecutive intramolecular H-shifts followed by O-2 addition, has been recognized, the detailed formation mechanisms remain highly uncertain. A primary reason is that the autoxidation process occurs on sub-second timescales and is extremely sensitive to environmental conditions like gas composition, temperature, and pressure. This, in turn, poses a great challenge for chemical kinetics studies to be able to mimic the relevant atmospheric reaction pathways, while simultaneously using conditions suitable for studying the short-lived radical intermediates. In this perspective, we define six specific challenges for this community to directly observe the initial steps of atmospherically relevant autoxidation reactions and thereby facilitate vital improvements in the understanding of VOC degradation and organic aerosol formation. (C) 2017 Wiley Periodicals, Inc. |
Subject: |
SECONDARY ORGANIC AEROSOL
OXIDIZED RO2 RADICALS GAS-PHASE OZONOLYSIS ALPHA-PINENE OZONOLYSIS MULTIFUNCTIONAL COMPOUNDS BIOGENIC EMISSIONS BETA-CARYOPHYLLENE MASS-SPECTROMETER PEROXY-RADICALS BOREAL FOREST 116 Chemical sciences 114 Physical sciences |
Peer reviewed: | Yes |
Usage restriction: | openAccess |
Self-archived version: | acceptedVersion |
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