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J Phys Chem A

Title:		Formation of Highly Oxidized Organic Compounds and Secondary Organic Aerosol from alpha-Thujene Ozonolysis
Author(s):		Dam M; Thomas AE; Smith JN;
Address:		"Department of Chemistry, University of California Irvine, 1120 Natural Sciences II, Irvine, California 92697-2025, United States"
Journal Title:		J Phys Chem A
Year:		2023
Volume:		20230815
Issue:		33
Page Number:		6989 - 6998
DOI:		10.1021/acs.jpca.3c02584
ISSN/ISBN:		1520-5215 (Electronic) 1089-5639 (Linking)
Abstract:		"We conducted laboratory chamber experiments to probe the gas- and particle-phase composition of oxidized organics and secondary organic aerosol (SOA) formed from alpha-thujene ozonolysis under different chemical regimes. The formation of low-volatility compounds was observed using chemical ionization mass spectrometry with nitrate (NO(3)(-)) and iodide (I(-)) reagent ions. The contribution of measured low-volatility compounds to particle growth was predicted using a simple condensational growth model and found to underpredict the measured growth rates in our chamber (on the order of several nm min(-1)). The yields of low-volatility compounds and SOA mass were similar to those of other monoterpene ozonolysis systems. While semivolatile compounds C(10)H(14-16)O(3-7) were measured most abundantly with I(-) reagent ion, a large fraction of products measured with NO(3)(-) were C(5-7) fragments with predicted intermediate volatility. Additionally, particle composition was measured with ultrahigh-performance liquid chromatography with high-resolution mass spectrometry and compared to particle composition from alpha-pinene ozonolysis. Structural isomers were identified from tandem mass spectrometry analysis of two abundant product ions (C(8)H(13)O(5)(-), C(19)H(27)O(7)(-)). Our results indicate that although this system efficiently generates low-volatility organics and SOA under the conditions studied, fragmentation pathways that produce more highly volatile products effectively compete with these processes"
Keywords:
Notes:		"PubMed-not-MEDLINEDam, Michelia Thomas, Adam E Smith, James N eng 2023/08/15 J Phys Chem A. 2023 Aug 24; 127(33):6989-6998. doi: 10.1021/acs.jpca.3c02584. Epub 2023 Aug 15"