引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 2258次   下载 1682 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Photodissociation of 2-Bromobutane at ~265 nm by Ion-velocity Map Imaging Technique
Dan-na Zhou,Rui Mao,Li-min Zhang,Qun Zhang,Yang Chen*
Author NameAffiliationE-mail
Dan-na Zhou Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Rui Mao Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Li-min Zhang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China lmzha@ustc.edu.cn 
Qun Zhang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China qunzh@ustc.edu.cn 
Yang Chen* Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China yangchen@ustc.edu.cn 
Abstract:
The photodissociation dynamics of 2-bromobutane has been investigated at 264.77 and 264.86 nm by ion-velocity map imaging technique coupled with resonance-enhanced multi-photon ionization. The speed and angular distributions have been derived from the velocity map images of Br and Br*. The speed distributions of Br and Br* atoms in the photodis-sociation of 2-bromobutane at ~265 nm can be fitted using only one Gaussian function indicating that bromine fragments were produced via direct dissociation of C-Br bond. The contributions of the excited 3Q0, 3Q1, and 1Q1 states to the products (Br and Br*) were discussed. It is found that the nonadiabatic 1Q13Q0 transition plays an important role for Br photofragment in the dissociation of 2-C4H9Br at ~265 nm. Relative quantum yield of 0.621 for Br(2P3/2) at ~265 nm in the photodissociation of 2-bromobutane is derived. By comparing the photodissociation of 2-C4H9Br at ~265 nm and that that at ~234 nm, the anisotropy parameter β(Br) and β(Br*), and relative quantum yield ?(Br) decrease with increasing wavelength, the probability of curve crossing between 3Q0 and 1Q1 decreases with increasing laser wavelength.
Key words:  Ion-velocity imaging, Photodissociation, 2-Bromobutane
FundProject:
2-溴丁烷在约265 nm光解离的离子速度成像
周丹娜,茆锐,张立敏*,张群*,陈旸*
摘要:
用离子速度成像结合共振增强多光子电离技术研究了2-溴丁烷分子在264.77和264.86 nm(约265 nm)的光解离动力学.从获得的离子速度图像确定了光解产物Br和Br*碎片的速度分布和角度分布.其速度分布可以由一个窄的高斯分布拟合得到,它对应于沿着C-Br伸缩模式的直接解离.2-溴丁烷在约265nm的光解离中1Q13Q0的非绝热跃迁在Br离子碎片的产生中起到非常重要的作用, 确定Br(2P3/2)的相对量子产额为0.621.通过约265和约234 nm处2-溴丁烷光解的比较发现,各向异性参数和相对量子产率随着波长增加而下降,3Q01Q1态势能面交叉几率随着波长增加而降低
关键词:  2-溴丁烷,离子速度成像,光解离
DOI:10.1088/1674-0068/25/04/373-378
分类号: