Elimination mechanisms of Br-2(+) and Br+ in photodissociation of 1,1-and 1,2-dibromoethylenes using velocity imaging technique
文献类型：期刊论文
| 作者 | Hua, Linqiang3,4; Lee, Wei-Bin1,2; Chao, Meng-Hsuan1,2; Zhang, Bing3,4; Lin, King-Chuen1,2 |
| 刊名 | JOURNAL OF CHEMICAL PHYSICS
 |
| 出版日期 | 2011-05-21 |
| 卷号 | 134期号:19 |
| 英文摘要 | Elimination pathways of the Br2+ and Br+ ionic fragments in photodissociation of 1,2- and 1,1-dibromoethylenes (C2H2Br2) at 233 nm are investigated using time-of-flight mass spectrometer equipped with velocity ion imaging. The Br2+ fragments are verified not to stem from ionization of neutral Br-2, that is a dissociation channel of dibromoethylenes reported previously. Instead, they are produced from dissociative ionization of dibromoethylene isomers. That is, C2H2Br2 is first ionized by absorbing two photons, followed by the dissociation scheme, C2H2Br2+ + hv -> Br-2(+) + C2H2. 1,2-C2H2Br2 gives rise to a bright Br2+ image with anisotropy parameter of -0.5 +/- 0.1; the fragment may recoil at an angle of similar to 66 degrees with respect to the C = C bond axis. However, this channel is relatively slow in 1,1-C2H2Br2 such that a weak Br2+ image is acquired with anisotropy parameter equal to zero, indicative of an isotropic recoil fragment distribution. It is more complicated to understand the formation mechanisms of Br+. Three routes are proposed for dissociation of 1,2-C2H2Br2, including (a) ionization of Br that is eliminated from C2H2Br2 by absorbing one photon, (b) dissociation from C2H2Br2+ by absorbing two more photons, and (c) dissociation of Br2+. Each pathway requires four photons to release one Br+, in contrast to the Br2+ formation that involves a three-photon process. As for 1,1-C2H2Br2, the first two pathways are the same, but the third one is too weak to be detected. (C) 2011 American Institute of Physics. [doi:10.1063/1.3584178] |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Physics, Atomic, Molecular & Chemical |
| 研究领域[WOS] | Physics |
| 关键词[WOS] | DOWN ABSORPTION-SPECTROSCOPY ; 193 NM PHOTODISSOCIATION ; VINYL BROMIDE ; ULTRAVIOLET PHOTODISSOCIATION ; MOLECULAR-OXYGEN ; BOND RUPTURE ; PHOTOELECTRON ; DECOMPOSITION ; DISSOCIATION ; PHOTOLYSIS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000291109900029 |
| 公开日期 | 2015-12-01 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/8226]  |
| 专题 | 武汉物理与数学研究所_2011年以前论文发表（包括2011年） |
| 作者单位 | 1.Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan 2.Acad Sinica, Inst Atom & Mol Sci, Taipei 106, Taiwan 3.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China 4.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hua, Linqiang,Lee, Wei-Bin,Chao, Meng-Hsuan,et al. Elimination mechanisms of Br-2(+) and Br+ in photodissociation of 1,1-and 1,2-dibromoethylenes using velocity imaging technique[J]. JOURNAL OF CHEMICAL PHYSICS,2011,134(19). |
| APA | Hua, Linqiang,Lee, Wei-Bin,Chao, Meng-Hsuan,Zhang, Bing,&Lin, King-Chuen.(2011).Elimination mechanisms of Br-2(+) and Br+ in photodissociation of 1,1-and 1,2-dibromoethylenes using velocity imaging technique.JOURNAL OF CHEMICAL PHYSICS,134(19). |
| MLA | Hua, Linqiang,et al."Elimination mechanisms of Br-2(+) and Br+ in photodissociation of 1,1-and 1,2-dibromoethylenes using velocity imaging technique".JOURNAL OF CHEMICAL PHYSICS 134.19(2011). |
入库方式： OAI收割
来源：武汉物理与数学研究所
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