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DOI	10.5194/acp-21-10799-2021
	Molecular composition and volatility of multi-generation products formed from isoprene oxidation by nitrate radical
	Wu R.; Vereecken L.; Tsiligiannis E.; Kang S.; Albrecht S.R.; Hantschke L.; Zhao D.; Novelli A.; Fuchs H.; Tillmann R.; Hohaus T.; Carlsson P.T.M.; Shenolikar J.; Bernard F.; Crowley J.N.; Fry J.L.; Brownwood B.; Thornton J.A.; Brown S.S.; Kiendler-Scharr A.; Wahner A.; Hallquist M.; Mentel T.F.
发表日期	2021
ISSN	1680-7316
起始页码	10799
结束页码	10824
卷号	21 期号:13
英文摘要	Isoprene oxidation by nitrate radical (NO3) is a potentially important source of secondary organic aerosol (SOA). It is suggested that the second or later-generation products are the more substantial contributors to SOA. However, there are few studies investigating the multi-generation chemistry of isoprene-NO3 reaction, and information about the volatility of different isoprene nitrates, which is essential to evaluate their potential to form SOA and determine their atmospheric fate, is rare. In this work, we studied the reaction between isoprene and NO3 in the SAPHIR chamber (Jülich) under near-atmospheric conditions. Various oxidation products were measured by a high-resolution time-of-flight chemical ionization mass spectrometer using Br- as the reagent ion. Most of the products detected are organic nitrates, and they are grouped into monomers (C4 and C5 products) and dimers (C10 products) with 1-3 nitrate groups according to their chemical composition. Most of the observed products match expected termination products observed in previous studies, but some compounds such as monomers and dimers with three nitrogen atoms were rarely reported in the literature as gas-phase products from isoprene oxidation by NO3. Possible formation mechanisms for these compounds are proposed. The multi-generation chemistry of isoprene and NO3 is characterized by taking advantage of the time behavior of different products. In addition, the vapor pressures of diverse isoprene nitrates are calculated by different parametrization methods. An estimation of the vapor pressure is also derived from their condensation behavior. According to our results, isoprene monomers belong to intermediate-volatility or semi-volatile organic compounds and thus have little effect on SOA formation. In contrast, the dimers are expected to have low or extremely low volatility, indicating that they are potentially substantial contributors to SOA. However, the monomers constitute 80 % of the total explained signals on average, while the dimers contribute less than 2 %, suggesting that the contribution of isoprene NO3 oxidation to SOA by condensation should be low under atmospheric conditions. We expect a SOA mass yield of about 5 % from the wall-loss- and dilution-corrected mass concentrations, assuming that all of the isoprene dimers in the low- or extremely low-volatility organic compound (LVOC or ELVOC) range will condense completely. © Copyright:
语种	英语
scopus关键词	aerosol; isoprene; molecular analysis; nitrate; oxidation
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246723
作者单位	Institute of Energy and Climate Research, Troposphere (IEK-8), Forschungszentrum Jülich GmbH, Jülich, 52428, Germany
推荐引用方式 GB/T 7714	Wu R.,Vereecken L.,Tsiligiannis E.,et al. Molecular composition and volatility of multi-generation products formed from isoprene oxidation by nitrate radical[J],2021,21(13).
APA	Wu R..,Vereecken L..,Tsiligiannis E..,Kang S..,Albrecht S.R..,...&Mentel T.F..(2021).Molecular composition and volatility of multi-generation products formed from isoprene oxidation by nitrate radical.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(13).
MLA	Wu R.,et al."Molecular composition and volatility of multi-generation products formed from isoprene oxidation by nitrate radical".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.13(2021).