Structures and reactivity of peroxy radicals and dimeric products revealed by online tandem mass spectrometry

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Tomaz , S , Wang , D , Zabalegui , N , Li , D , Lamkaddam , H , Bachmeier , F , Vogel , A , Eugenia Monge , M , Perrier , S , Baltensperger , U , George , C , Rissanen , M , Ehn , M , Haddad , I E & Riva , M 2021 , ' Structures and reactivity of peroxy radicals and dimeric products revealed by online tandem mass spectrometry ' , Nature Communications , vol. 12 , no. 1 , 300 . https://doi.org/10.1038/s41467-020-20532-2

Title: Structures and reactivity of peroxy radicals and dimeric products revealed by online tandem mass spectrometry
Author: Tomaz, Sophie; Wang, Dongyu; Zabalegui, Nicolas; Li, Dandan; Lamkaddam, Houssni; Bachmeier, Franziska; Vogel, Alexander; Eugenia Monge, Maria; Perrier, Sebastien; Baltensperger, Urs; George, Christian; Rissanen, Matti; Ehn, Mikael; Haddad, Imad El; Riva, Matthieu
Contributor: University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2021-01-12
Language: eng
Number of pages: 9
Belongs to series: Nature Communications
ISSN: 2041-1723
URI: http://hdl.handle.net/10138/332640
Abstract: Organic peroxy radicals (RO2) play a pivotal role in the degradation of hydrocarbons. The autoxidation of atmospheric RO2 radicals produces highly oxygenated organic molecules (HOMs), including low-volatility ROOR dimers formed by bimolecular RO2 + RO2 reactions. HOMs can initiate and greatly contribute to the formation and growth of atmospheric particles. As a result, HOMs have far-reaching health and climate implications. Nevertheless, the structures and formation mechanism of RO2 radicals and HOMs remain elusive. Here, we present the in-situ characterization of RO2 and dimer structure in the gas-phase, using online tandem mass spectrometry analyses. In this study, we constrain the structures and formation pathway of several HOM-RO2 radicals and dimers produced from monoterpene ozonolysis, a prominent atmospheric oxidation process. In addition to providing insights into atmospheric HOM chemistry, this study debuts online tandem MS analyses as a unique approach for the chemical characterization of reactive compounds, e.g., organic radicals.
Subject: 114 Physical sciences
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