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Time-sliced Velocity Map Imaging Study on Photodissociation of Neopentyl Bromide and Tert-pentyl Bromide at 234 nm
Rui Mao,Qun Zhang*,Jian-zheng Zang,Zhi-guo Zhang,Chao He,Cheng-bing Qin,Yang Chen*
Author NameAffiliationE-mail
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  
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 
Jian-zheng Zang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Zhi-guo 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  
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  
Cheng-bing Qin Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
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:
We present a first velocity map imaging study on the 234 nm photodissociation dynamics of two carbon-chain branched alkyl bromides, neopentyl bromide (denoted as NPB) and tert-pentyl bromide (denoted as TPB). Unlike the 234 nm photodissociation of the unbranched n-C5H11Br molecule where only a direct fission of the C-Br bond is involved, the branched NPB and TPB molecules exhibit one and two more independent dissociation pathways with much energy being decayed via an extensive excitation of the bending modes of the parent molecules prior to the C-Br bond fission. This observation strongly suggests that the disso- ciation coordinate for the two carbon-chain branched molecules is no longer solely ascribed to the C-Br stretching mode but rather a combination of the bending-stretching modes.
Key words:  Velocity map imaging, Photodissociation dynamics, Neopentyl bromide, Tert-pentyl bromide
FundProject:
新戊基溴和叔戊基溴在234 nm的光解动力学
茆锐,张群*,臧建正,张志国,何超,秦成兵,陈旸*
摘要:
使用离子速度成像技术研究了新戊基溴和叔戊基溴的234 nm光解动力学. 由于它们具有比正戊基溴更多的支链,因此不仅可以观测到C-Br键的直接断裂,还分别存在一个和两个由于弯曲振动模被激发引起的慢速解离通道,母体分子在C-Br键断裂之前就已经有大量的可资用能被用于激发弯曲振动模. 这些充分说明了新戊基溴和叔戊基溴在234 nm光解中C-Br键的断裂是由于伸缩振动和弯曲振动的耦合而产生的,而不单纯归咎于伸缩振动引起.
关键词:  离子速度成像,光解动力学,新戊基溴,叔戊基溴
DOI:10.1088/1674-0068/24/05/631-634
分类号: