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DOI	10.5194/acp-20-5145-2020
	Formation of highly oxygenated organic molecules from chlorine-Atom-initiated oxidation of alpha-pinene
	Wang Y.; Riva M.; Xie H.; Heikkinen L.; Schallhart S.; Zha Q.; Yan C.; He X.-C.; Peräkylä O.; Ehn M.
发表日期	2020
ISSN	16807316
起始页码	5145
结束页码	5155
卷号	20 期号:8
英文摘要	Highly oxygenated organic molecules (HOMs) from atmospheric oxidation of alpha-pinene can irreversibly condense to particles and contribute to secondary organic aerosol (SOA) formation. Recently, the formation of nitryl chloride (ClNO2) from heterogeneous reactions, followed by its subsequent photolysis, is suggested to be an important source of chlorine atoms in many parts of the atmosphere. However, the oxidation of monoterpenes such as alpha-pinene by chlorine atoms has received very little attention, and the ability of this reaction to form HOMs is completely unstudied. Here, chamber experiments were conducted with alpha-pinene and chlorine under low-and high-nitrogen-oxide (NOx , NOx D NOCNO2) conditions. A nitrate-based CI-APi-ToF (chemical ionization-atmospheric pressure interface-time of flight) mass spectrometer was used to measure HOM products. Clear distributions of monomers with 9-10 carbon atoms and dimers with 18- 20 carbon atoms were observed under low-NOx conditions. With increased concentration of NOx within the chamber, the formation of dimers was suppressed due to the reactions of peroxy radicals with NO.We estimated the HOM yields from chlorine-initiated oxidation of alpha-pinene under low-NOx conditions to be around 1.8 %, though with a substantial uncertainty range (0.8 %-4 %) due to lack of suitable calibration methods. Corresponding yields at high NOx could not be determined because of concurrent ozonolysis reactions. Our study demonstrates that also the oxidation of alpha-pinene by chlorine atoms and yield low-volatility organic compounds. © 2020 Copernicus GmbH. All rights reserved.
关键词	aerosol concentration (composition)heterogeneity hydroxyl radical molecular analysis nitrogen oxides pyrolysis
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132067
推荐引用方式 GB/T 7714	Wang Y.,Riva M.,Xie H.,et al. Formation of highly oxygenated organic molecules from chlorine-Atom-initiated oxidation of alpha-pinene[J]. Atmospheric Chemistry and Physics,2020,20(8).
APA	Wang Y..,Riva M..,Xie H..,Heikkinen L..,Schallhart S..,...&Ehn M..(2020).Formation of highly oxygenated organic molecules from chlorine-Atom-initiated oxidation of alpha-pinene.,20(8).
MLA	Wang Y.,et al."Formation of highly oxygenated organic molecules from chlorine-Atom-initiated oxidation of alpha-pinene".20.8(2020).