Highly Oxygenated Molecules from Atmospheric Autoxidation of Hydrocarbons : A Prominent Challenge for Chemical Kinetics Studies

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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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