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Photodissociation of 2-Bromobutane by Ion-velocity Map Imaging Technique
Dan-na Zhou, Rui Mao, Li-min Zhang*, Qun Zhang*, Yang Chen*
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:
The photodissociation dynamics of 2-bromobutane has been investigated at 233.62 and 233.95 nm by ion-velocity map imaging technique coupled with resonance-enhanced mul-tiphoton ionization. The speed and angular distribution of Br and Br* fragments were determined from the map images. The two Gaussian components, shown in the speed dis-tributions of Br and Br* atoms, are suggested to attribute to the two independent reaction paths of photodissociation for 2-bromobutane at 233.62 and 233.95 nm. The high-energy component is related to the prompt dissociation along the C-Br stretching mode, and the low-energy component to the dissociation from the repulsive mode with bending and C-Br stretching combination. The contributions of the excited 3Q0, 3Q1, and 1Q1 states to the products (Br and Br*) were discussed. Relative quantum yield of 0.924 for Br(2P3/2) at about 234 nm in the photodissociation of 2-bromobutane is derived.
Key words:  Ion-velocity imaging, Photodissociation, 2-bromobutane
FundProject:
2-溴丁烷光解离的离子速度成像方法
周丹娜, 茆锐, 张立敏*, 张群*, 陈旸*
中国科学技术大学合肥微尺度物质科学国家实验室,化学物理系,合肥230026
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-溴丁烷在233.62和233.95 nm的光解离动力学. 从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. Br和Br¤速度分布中包含的两个高斯分量是来自于2-溴丁烷在约234 nm处的两个独立的光解离反应通道. 高能的高斯分量对应于沿着C-Br伸缩模式的直接解离,低能的高斯分量对应于弯曲振动和C?Br伸缩振动耦合形成的排斥模式的解离. 讨论了2-溴丁烷光解离中3Q03Q
关键词:  离子速度成像,光解离
DOI:10.1088/1674-0068/24/06/647-652
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