Halogen effect on the photodissociation mechanism for gas-phase bromobenzene and iodobenzene
文献类型：期刊论文
| 作者 | Zhang, Xiao-Peng1,2; Wei, Zheng-Rong3; Tang, Ying3; Chao, Ting-Jung1,2; Zhang, Bing3; Lin, King-Chuen1,2 |
| 刊名 | CHEMPHYSCHEM
 |
| 出版日期 | 2008-06-02 |
| 卷号 | 9期号:8页码:1130-1136 |
| 关键词 | halogens photochemistry resonance-enhanced multiphoton ionization reactive intermediates velocity imaging |
| 英文摘要 | The velocity imaging technique combined with (2+1) resonance-enhanced multiphoton ionization (REMPI) is used to detect the halogen fragments in the photodissociation of bromobenzene and iodobenzene at 266 nm. With the aid of potential energy curve calculations by Lunell (Y. J. Liu, P. Persson, S. Lunell, J. Phys. Chem. A 2004, 108, 2339-2345.), the Br fragmentation is proposed to stem from excitation of the lowest excited singlet (pi - pi*) state followed by predissociation along a repulsive triplet (n - sigma*) state. The slowed dissociation rate leads to production of the isotropic Br fragments and 93% internal energy deposition. Only the ground state Br(P-2(3/2)) is detectable. In contrast, when iodine is substituted, the iodine effect stabilizes the repulsive states associated with the I-C6H5 bond rupture and the subsequent dissociation channels become more complicated. 84% of the iodobenzene molecules obtained follow a direct dissociation channel, while the remaining undergo a predissociative process. Both routes result in rapid dissociation with anisotropy parameters of 0.7 +/- 0.2 and 0.9 +/- 0.2 as well as 70% and 26% in the fractions of translational energy deposition, respectively. The relative quantum yields of 1* and 1 are 0.35 and 0.65 and their related photodissociation pathways are discussed in detail. |
| 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] | PHOTOFRAGMENT TRANSLATIONAL SPECTROSCOPY ; PUMP-PROBE SPECTROSCOPY ; 266 NM ; ENERGY REDISTRIBUTION ; ULTRAVIOLET RANGE ; P-BROMOTOLUENE ; ARYL HALIDES ; DYNAMICS ; DISSOCIATION ; MOLECULES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000256855300009 |
| 公开日期 | 2015-10-13 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/7986]  |
| 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.Acad Sinica, Inst Atom & Mol Sci, Taipei 106, Taiwan 2.Natl Taiwan Univ, Dept Chem, 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,Tang, Ying,et al. Halogen effect on the photodissociation mechanism for gas-phase bromobenzene and iodobenzene[J]. CHEMPHYSCHEM,2008,9(8):1130-1136. |
| APA | Zhang, Xiao-Peng,Wei, Zheng-Rong,Tang, Ying,Chao, Ting-Jung,Zhang, Bing,&Lin, King-Chuen.(2008).Halogen effect on the photodissociation mechanism for gas-phase bromobenzene and iodobenzene.CHEMPHYSCHEM,9(8),1130-1136. |
| MLA | Zhang, Xiao-Peng,et al."Halogen effect on the photodissociation mechanism for gas-phase bromobenzene and iodobenzene".CHEMPHYSCHEM 9.8(2008):1130-1136. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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