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Photodissociation Dynamics of CS2 at the 1 B2(1 Σ+u ) State
Guo Ying,Xu Haifeng,Li Qifeng,Shi Yong,Dai Jinhua,Liu Shilin*, Ma Xingxiao
Author NameAffiliationE-mail
Guo Ying Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Xu Haifeng Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Li Qifeng Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Shi Yong Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Dai Jinhua Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Liu Shilin* Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 slliu@ustc.edu.cn 
Ma Xingxiao Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Abstract:
The predissociation dynamics of CS2 at the g vibrational level of the 1B2(1Σu+) state has been studied, by measuring the predissociation lifetimes from the photofragment CS excitation (PHOFEX) spectrum and the ro vibrational populations of CS fragment from the laser induced fluorescence(LIF) spectrum. It is found that the angular momentum quantum number K of the g level accelerates the dissociation speed of CS2 at the 1B2(1Σu+) state, and increases the branching ratio of S(1D2)/S(3PJ) for the two dissociation channels, CS(X 1Σ+)+S(1D2) and CS(X 1Σ+)+S(3PJ). The dissociation mechanism was discussed based upon the observations.
Key words:  Lifetime, Dissociation branching ratio, Ro vibrational population, Energy partition ration, Predissociation dynamics
FundProject:
CS2 分子 1 B2(1 Σ+u )态预解离动力学研究
郭颖,徐海峰,李奇峰,石勇,戴静华,刘世林*,马兴孝
摘要:
研究了CS2分子 1B2(1Σ+u)预离解态线形势垒下的g振动能级光解动力学,包括预解离寿命、产物振转布居、平动-振动-转动能量分配和解离通道分支比.在实验过程中,一束可调谐激光激发超声射流冷却的CS2分子到1B2(1Σ+u)电子态,光解产物CS用另一束可调谐激光通过激光诱导荧光(LIF)方法检测.通过拟合光解碎片激发谱的谱峰轮廓,获得了源于不同跃迁初始态的 1B2(1Σ+u)态g振动能级的预解离寿命.通过分析CS的LIF光谱,则获得了不同光解波长下CS碎片的v=0~8振动态布居、 v =1、 4~8振动态的转动布居、能量分配以及两个预解离通道CS(X 1Σ+)+S(3PJ)和CS(X 1Σ+)+S(1D2)的分支比.实验还考察了初始态弯曲振动量子数v2″、振动角动量量子数l对解离动力学的影响.发现v2″的影响不大,而l的影响却是明显的.较大的l(=K)对应于较短的寿命和较小的通道分支比S(3PJ)/S(1D2),即大的l(=K)有利于预解离的发生,同时更有利于产生S(1D2).
关键词:  CS2分子1B2(1Σ+u)态  预解离寿命  通道分支比  振转能量分配  光解动力学
DOI:10.1088/1674-0068/18/2/145-151
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