Photodissociation study of ethyl bromide in the ultraviolet range by the ion-velocity imaging technique
文献类型：期刊论文
| 作者 | Tang, Y; Ji, L; Zhu, RS; Wei, ZR; Zhang, B |
| 刊名 | CHEMPHYSCHEM
 |
| 出版日期 | 2005-10-14 |
| 卷号 | 6期号:10页码:2137-2144 |
| 关键词 | ethyl bromide ion velocity imaging molecular dynamics photolysis |
| 英文摘要 | The photodissociation of ethyl bromide has been studied in the wavelength range of 231-267 nm by means of the ion velocity imaging technique coupled with a [2 + 1] resonance-enhanced multiphoton ionization (REMPI) scheme. The velocity distributions for the Br ((2)P(1/2)) (denoted Br*) and Br ((2)(3,2)) (denoted Br) fragments are determined, and each can be well-fitted by a narrow single-peaked Gaussian curve, which suggests that the bromine fragments are generated as a result of direct dissociation via repulsive potential-energy surfaces (PES). The recoil anisotropy results show that beta(Br) and beta(Br*) decrease with the wavelength, and the angular distributions of Br* suggest a typical parallel transition. The product relative quantum yields at two different wavelengths are Phi(234nm)(Br*) 0.17 and Phi(276nm)(Br*) = 0.31. The relative fractions of each potential surface for the bromine fragments' production at 234 and 267 nm reveal the existence of a curve crossing between the 3Q(0) and (1)Q(1) potential surfaces, and the probability of curve crossing decreases with the laser wavelength. The symmetry reduction of C(2)H(5)Br from C,, to C, invokes a nonadiabotic coupling between the 3Q(0) and (1)Q(1) states, and with higher energy photons, the probability that crossing will take place increases. |
| 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] | FLIGHT MASS-SPECTROMETRY ; 234 NM ; METHYL-IODIDE ; RECOIL ANISOTROPY ; BOND FISSION ; A-BAND ; DYNAMICS ; IONIZATION ; DISSOCIATION ; PHOTOLYSIS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000232725900021 |
| 公开日期 | 2015-07-28 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/4459]  |
| 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.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, Y,Ji, L,Zhu, RS,et al. Photodissociation study of ethyl bromide in the ultraviolet range by the ion-velocity imaging technique[J]. CHEMPHYSCHEM,2005,6(10):2137-2144. |
| APA | Tang, Y,Ji, L,Zhu, RS,Wei, ZR,&Zhang, B.(2005).Photodissociation study of ethyl bromide in the ultraviolet range by the ion-velocity imaging technique.CHEMPHYSCHEM,6(10),2137-2144. |
| MLA | Tang, Y,et al."Photodissociation study of ethyl bromide in the ultraviolet range by the ion-velocity imaging technique".CHEMPHYSCHEM 6.10(2005):2137-2144. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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