title: A VUV photoionization mass spectrometric study on the OH-initiated photooxidation of isoprene with synchrotron radiation.
abstract: The gas-phase organic compounds resulting from OH-initiated photooxidation of isoprene have been investigated on-line by VUV photoionization mass spectrometry based on synchrotron radiation for the first time. The photoionization efficiency curves of the corresponding gaseous products as well as the chosen standards have been deduced by gating the interested peaks in the photoionization mass spectra while scanning the photon energy simultaneously, which permits the identification of the pivotal gaseous products of the photooxidation of isoprene, such as formaldehyde (10.84 eV), formic acid (11.38 eV), acetone (9.68 eV), glyoxal (9.84 eV), acetic acid (10.75 eV), methacrolein (9.91 eV), and methyl vinyl ketone (9.66 eV). Proposed reaction mechanisms leading to the formation of these key products were discussed, which were completely consistent with the previous works of different groups. The capability of synchrotron radiation photoionization mass spectrometry to directly identify the chemical composition of the gaseous products in a simulation chamber has been demonstrated, and its potential application in related studies of atmospheric oxidation of ambient volatile organic compounds is anticipated.
authors.affiliation: Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Pan
authors.forename: Changjin
authors.initials: C
authors.lastname: Hu
authors.forename: Mingqiang
authors.initials: M
authors.lastname: Huang
authors.forename: Zhenya
authors.initials: Z
authors.lastname: Wang
authors.forename: Yue
authors.initials: Y
authors.lastname: Cheng
authors.forename: Zhi
authors.initials: Z
authors.lastname: Liu
authors.forename: Xuejun
authors.initials: X
authors.lastname: Gu
authors.forename: Weixiong
authors.initials: W
authors.lastname: Zhao
authors.forename: Weijun
authors.initials: W
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Fuyi
authors.initials: F
authors.lastname: Liu
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Shan
authors.forename: Liusi
authors.initials: L
authors.lastname: Sheng
mesh_terms: D002070:Butadienes / Q000737:chemistry* / Q000528:radiation effects; D045782:Hemiterpenes / Q000737:chemistry* / Q000528:radiation effects; D013058:Mass Spectrometry; D010084:Oxidation-Reduction; D010420:Pentanes / Q000737:chemistry* / Q000528:radiation effects; D017356:Synchrotrons
chemical_list: D002070:Butadienes; D045782:Hemiterpenes; D010420:Pentanes; C005059:isoprene