Photodissociation of dibromobenzenes at 266 nm by the velocity imaging technique
文献类型：期刊论文
| 作者 | Zhang, Xiao-Peng1,2; Wei, Zheng-Rong3; Lee, Wei-Bin1,2; Chao, Ting-Jung1,2; Lin, King-Chuen1,2 |
| 刊名 | CHEMPHYSCHEM
 |
| 出版日期 | 2008-08-25 |
| 卷号 | 9期号:12页码:1721-1728 |
| 关键词 | bromine laser spectroscopy photochemistry resonance-enhanced multiphoton ionization velocity imaging |
| 英文摘要 | A velocity imaging technique combined with (2 + 1) resonance-enhanced multiphoton ionization (REMPI) is used to detect the primary Br(P-2(3/2)) fragment in the photodissociation of o-, m-, and p-dibromobenzene at 266 nm. The obtained translational energy distributions suggest that the Br fragments ore produced via two dissociation channels. For o- and m-dibromobenzene, the slow channel that yields an anisotropy parameter close to zero is proposed to stem from excitation of the lowest excited singlet (pi,pi*) state followed by predissociation along a repulsive triplet (n,sigma*) state localized on the C-Br bond. The fast channel that gives rise to an anisotropy parameter of 0.53-0.73 is attributed to a bound triplet state with smaller dissociation barrier. For p-dibromobenzene, the dissociation rates ore reversed, because the barrier for the bound triplet state becomes higher than the singlet-triplet crossing energy. The fractions of translational energy release are determined to be 6-8 and 29-40% for the slow and fast channels, respectively; the quantum yields are 0.2 and 0.8, and are insensitive to the position of the substituent. The Br fragmentation from bromobenzene and bromofluorobenzenes at the same photolyzing wavelength is also compared to understand the effect of the number of halogen atoms on the phenyl ring. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Chemistry, Physical ; Physics, Atomic, Molecular & Chemical |
| 研究领域[WOS] | Chemistry ; Physics |
| 关键词[WOS] | PUMP-PROBE SPECTROSCOPY ; ARYL HALIDES ; MULTIPHOTON IONIZATION ; ENERGY REDISTRIBUTION ; MOLECULAR-BEAMS ; DYNAMICS ; IODOBENZENE ; BROMOBENZENE ; STATE ; BROMOFLUOROBENZENES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000258851200010 |
| 公开日期 | 2015-10-13 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/8080]  |
| 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 |
| 推荐引用方式 GB/T 7714 | Zhang, Xiao-Peng,Wei, Zheng-Rong,Lee, Wei-Bin,et al. Photodissociation of dibromobenzenes at 266 nm by the velocity imaging technique[J]. CHEMPHYSCHEM,2008,9(12):1721-1728. |
| APA | Zhang, Xiao-Peng,Wei, Zheng-Rong,Lee, Wei-Bin,Chao, Ting-Jung,&Lin, King-Chuen.(2008).Photodissociation of dibromobenzenes at 266 nm by the velocity imaging technique.CHEMPHYSCHEM,9(12),1721-1728. |
| MLA | Zhang, Xiao-Peng,et al."Photodissociation of dibromobenzenes at 266 nm by the velocity imaging technique".CHEMPHYSCHEM 9.12(2008):1721-1728. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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