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Effect of Vibrational Angular Momentum on the Lifetime of CS21B2(1Σ)State
Guo Ying,Xu Haifeng,Li Qifeng,Shi Yong,Dai Jinhua,Liu Shilin**,Ma Xingxiao
Author NameAffiliationE-mail
Guo Ying Open Laboratory of Bond Selective ChemistryDepartment of Chemical Physics  
Xu Haifeng Open Laboratory of Bond Selective ChemistryDepartment of Chemical Physics  
Li Qifeng Open Laboratory of Bond Selective ChemistryDepartment of Chemical Physics  
Shi Yong Open Laboratory of Bond Selective ChemistryDepartment of Chemical Physics  
Dai Jinhua Open Laboratory of Bond Selective ChemistryDepartment of Chemical Physics  
Liu Shilin** Open Laboratory of Bond Selective ChemistryDepartment of Chemical Physics slliu@ustc.edu.cn 
Ma Xingxiao Open Laboratory of Bond Selective ChemistryDepartment of Chemical Physics  
Abstract:
Predissociation lifetimes of totally 13 vibrational levels in the 1B2 state of jet-cooled CS2 have been determined by simulating the rotational band contours of the PHOFEX spectrum in the range of 209. 5 ~ 216 nm, where the PHOFEX spectrum was obtained by monitoring the laser-induced fluorescence of CS fragment via the Q band head excitation of(A 1Π,v' = 0)&(X 1Σ + ,v" = 0)transition. In order to investigate the influence of vibrational angular momentum quantum number K of the excited 1B2 ( 1Σ + U )state,the nozzle was heated to increase the hot-band transition intensities. The results indicate that,for levels with the same vibrational quantum number but different K numbers in the 1B2 ( 1Σ + u )state of CS2 ,the lifetime decreases with the increasing of quantum number K, suggesting that the dissociation could be accelerated by K number.
Key words:  PHOFEX spectrum,Predissociation lifetime,Hot-band transition
FundProject:
弯曲振动对CS2分子1B2(1Σ)态预解离寿命的影响
郭颖,徐海峰,李奇峰,石勇,戴静华,刘世林*,马兴孝
摘要:
在209.5~216 nm,采用光解碎片激发 (PHOFEX)谱技术,对CS2分子1B2(1Σ+u)态预解离寿命进行了考察.测量在超声射流中进行.信号来自解离碎片CS (A 1Π, v'=0←X 1Σ+, v″=0)Q支带头的激光诱导荧光(LIF).预解离寿命是通过对谱带进行拟合来提取的.拟合中假定基态转动布居为Boltzmann分布,寿命加宽的转动谱线为Lorentz线形.通过拟合共获得1B2(1Σ+u)态13个跃迁所对应的预解离寿命,其中6个数据是新得到的.结果表明,基态振动角动量量子数l或激发态转动角量子数K(K=l)对预解离寿命有明显的影响.对于激发态的同一振动能级,较大的K对应于较短的预解离寿命.实验中采用可加热的射流喷嘴,用以提高热带激发的强度,以改善对较大转动角量子数K的影响的考察.
关键词:  PHOFEX谱  预解离寿命  喷嘴加热
DOI:10.1088/1674-0068/18/1/9-14
分类号: