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Direct detection of isoprene photooxidation products by using synchrotron radiation photoionization mass spectrometry
Author(s) -
Pan Gang,
Hu Changjin,
Wang Zhenya,
Cheng Yue,
Zheng Xiaohong,
Gu Xuejun,
Zhao Weixiong,
Zhang Weijun,
Chen Jun,
Liu Fuyi,
Shan Xiaobin,
Sheng Liusi
Publication year - 2011
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.5295
Subject(s) - methacrolein , chemistry , mass spectrometry , photoionization , isoprene , methyl vinyl ketone , formic acid , photochemistry , synchrotron radiation , analytical chemistry (journal) , organic chemistry , ionization , chromatography , methacrylic acid , catalysis , ion , physics , monomer , quantum mechanics , copolymer , polymer
We report the combination of a vacuum ultraviolet photoionization mass spectrometer, operating on the basis of synchrotron radiation, with an environmental reaction smog chamber for the first time. The gas‐ and pseudo‐particle‐phase products of OH‐initiated isoprene photooxidation reactions were measured on‐line and off‐line, respectively, by mass spectrometry. It was observed that aldehydes, methacrolein, methyl vinyl ketone, methelglyoxal, formic acid, and similar compounds are the predominant gas‐phase photooxidation products, whereas some multifunctional carbonyls and acids mainly exist in the particle phase. This finding is reasonably consistent with results of studies conducted in other laboratories using different methods. The results indicate that synchrotron radiation photoionization mass spectrometry coupled with a smog chamber is a potentially powerful tool for the study of the mechanism of atmospheric oxidations and the formation of secondary organic aerosols. Copyright © 2011 John Wiley & Sons, Ltd.