Ultraviolet photodissociation dynamics of dibromoalkane
文献类型：期刊论文
| 作者 | Ji, L; Tang, Y; Zhu, RS; Tang, BF; Zhang, S; Zhang, B |
| 刊名 | ACTA CHIMICA SINICA
 |
| 出版日期 | 2004-07-14 |
| 卷号 | 62期号:13页码:1211-1216 |
| 关键词 | resonance-enhanced multiphoton ionization time-of-flight mass spectrometry photodissociation dynamics branching ratio |
| 英文摘要 | The photodissociation dynamics of CH2Br2, C2H4Br2, C3H6Br2 and C4H8Br2 near 234 and 267 nm have been studied using time-of-flight mass spectrometry. It was found that photoexcitation of dibromoalkane in IN absorption band results in prompt fission of the C-Br bond, producing two distinguishable photodissociation products: ground state Br(P-2(3/2)0) and spin-orbit state Br(P-2(1/2)0) To achieve state-selective detection of Br and Br*, a (2 + 1) resonance-enhanced multiphoton ionization (REMPI) scheme was employed. The branching ratio of the photodissociation products was extracted from the relative signal intensities of Br* and Br in the REMPI TOF spectra. The findings of this work reveal that a nonadiabatic curve-crossing between the (3)Q(0) and (1)Q(1), states is responsible for the reduction in the symmetry of the molecule in the photodissociation process To C4H8Br2, the further reduction in the molecular symmetry induces level-splitting to more electronic states, then the coupling between these states causes an avoided crossing, which can change the photodissociation paths accordingly. The wavelength dependence of the branching ratio for both Br and Br* channels provides insight into the nature of the electronic excited states which contribute to the absorption spectrum and the role of nonadiabatic curve crossing in the photodissociation process. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Chemistry, Multidisciplinary |
| 研究领域[WOS] | Chemistry |
| 关键词[WOS] | NM |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000222664100005 |
| 公开日期 | 2015-07-28 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/4411]  |
| 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 | 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 | Ji, L,Tang, Y,Zhu, RS,et al. Ultraviolet photodissociation dynamics of dibromoalkane[J]. ACTA CHIMICA SINICA,2004,62(13):1211-1216. |
| APA | Ji, L,Tang, Y,Zhu, RS,Tang, BF,Zhang, S,&Zhang, B.(2004).Ultraviolet photodissociation dynamics of dibromoalkane.ACTA CHIMICA SINICA,62(13),1211-1216. |
| MLA | Ji, L,et al."Ultraviolet photodissociation dynamics of dibromoalkane".ACTA CHIMICA SINICA 62.13(2004):1211-1216. |
入库方式： OAI收割
来源：武汉物理与数学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。