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Using Ion-velocity Map Imaging Technique to Study Photodissociation of 2-Bromopentane
Zhong Gu,Min Chen,Chao He,Xi-lin Bai,Rui Mao*,Qun Zhang*,Yang Chen*
Author NameAffiliationE-mail
Zhong Gu Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Min 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  
Chao He Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Xi-lin Bai 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 maorui@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-bromopentane at ~234 nm has been investigated by utilizing ion-velocity map imaging technique. The mapped images of Br(2P3/2) (denoted as Br) and Br(2P1/2) (denoted as Br*) fragments were analyzed by means of the speed and angular distributions, respectively. The speed distributions can be fitted with two Gaussian components which are correlated to the two independent reaction paths on the excited po-tential energy surfaces (PES). The high-energy component is from the prompt dissociation along the C-Br stretching mode, while the low-energy one is related to the dissociation from the coupling of the C-Br stretching and bending modes. Relative quantum yield is measured to be 0.892 for Br in the photodissociation of 2-bromopentane at 234 nm. Com-bining the anisotropy parameter with the relative quantum yield of Br and Br* fragments, the contributions of the excited 3Q03Q1, and 1Q1 states to the products Br and Br* were derived. The effect of alkyl branching on the mechanism of photodissociation was discussed by comparing the photodissociation processes of four isomers of bromopentane.
Key words:  Ion-velocity imaging, Photodissociation, 2-Bromopentane
FundProject:
离子速度成像技术研究2-溴戊烷的光解离动力学
顾忠,陈旻,何超,白西林,茆锐*,张群*,陈旸*
摘要:
运用离子速度成像技术研究了2-溴戊烷分子在~234 nm处的光解离动力学. 通过分析光解产物Br(2P3/2)(简称Br)和Br(2P1/2) (简称Br*)的速度影像,分别得到其速度分布和角度分布. Br和Br*的速度分布可以用两个高斯分布拟合,分别对应于2-溴戊烷在~234 nm处两个独立的光解离反应通道. 高能的高斯分量对应于C-Br伸缩振动模式的直接解离,低能的高斯分量对应于弯曲振动和C-Br伸缩振动耦合所导致的解离. 确定出光解离产物Br的相对量子产率为0.892,结合Br和Br*碎片的各项异性参数和溴原子的相对量子产率,讨论了3Q03Q11Q1激发态分别对产物Br和Br*的贡献. 通过对比溴代戊烷4种同分异构体光解离过程的差异,讨论了分子烷基分支化对光解机理的影响.
关键词:  离子速度成像,光解离,2-溴戊烷
DOI:10.1063/1674-0068/26/05/493-497
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