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Photodissociation of CS2+( 2 Πg) via (1+1) Excitation
Chen Jun,Xu Haifeng,Guo Ying,Dai Jinghua,Zhang Limin,Liu Shilin,Ma Xingxiao
Author NameAffiliation
Chen Jun Open Laboratory of Bond-Selecteve Chemistry, Department of Chemical Physics,. University of Science and Technology of China, Hefei 230026 
Xu Haifeng Open Laboratory of Bond-Selecteve Chemistry, Department of Chemical Physics,. University of Science and Technology of China, Hefei 230026 
Guo Ying Open Laboratory of Bond-Selecteve Chemistry, Department of Chemical Physics,. University of Science and Technology of China, Hefei 230026 
Dai Jinghua Open Laboratory of Bond-Selecteve Chemistry, Department of Chemical Physics,. University of Science and Technology of China, Hefei 230026 
Zhang Limin Open Laboratory of Bond-Selecteve Chemistry, Department of Chemical Physics,. University of Science and Technology of China, Hefei 230026 
Liu Shilin Open Laboratory of Bond-Selecteve Chemistry, Department of Chemical Physics,. University of Science and Technology of China, Hefei 230026 
Ma Xingxiao Open Laboratory of Bond-Selecteve Chemistry, Department of Chemical Physics,. University of Science and Technology of China, Hefei 230026 
Abstract:
Photodissociation dynamics of CS2+molecular ions has been investigated by (1+two-photon resonance technique. CS2+were prepared by (3+1) resonance-enhanced multi-photon ionization (REMPI) of CS2molecules at 483. 2nm. The photofragment S+excitati (PHOFEX) spectra were recorded by scanning another laser in the 424~482nm region, and we assigned essentially to CS2+(~A2Πu,3/2(v′=0~4)←~X2Πg,3/2(0,0,0)) and (~A2Πu,1/2(v′=0,4)←~X2Πg,1/2(0,0,0)) (herev′=v1′+(1/2)v2′) transitions. The S+production channel wpreliminarily attributed to, (i) one-photon excitation CS2+from the ground state~X2Πgto texcited state~A2Πu; (ii) vibronic coupling between the~A2Πustate and the high vibrational lev in the~X2Πgstate; (iii) second photon excitation from the coupling vibrational levels to the excied state~B2Σu+and dissociation to produce S++ CS via the repulsive4Σ-state through spin-orb interaction between the~B2Σu+and4Σ-states.
Key words:  CS2+, Photodissociation, Photofragment excitation
FundProject:95攀登计划"分子反应动力学和原子分子激发态”、国家自然科学基金(29873047)及NKBRSF研究(G199075304)资助项目.
CS2+( 2Πg )的(1+1)光解离动力学研究
陈军,徐海峰,郭颖,戴静华,张立敏,刘世林,马兴孝
摘要:
在气束条件下,利用483.2nm的激光(3+1)共振增强多光子电离(REMPI)CS2分子以产生CS2+离子源,用另一束可调谐激光在424~482nm内,通过对CS2+(2Πg)(1+1)双光子共振解离产生的碎片离子激发谱的探测,来获取CS2+的光解离动力学信息.光解离碎片S+的激发谱(PHOFEX)可归属为CS2+(2Πu,3/2(v′=0~4,v′=v1′+(1/2)v2′)←2Πg,3/2(0,0,0))和(2Πu,1/2(v′=0~4)←2Πg,1/2(0,0,0))的跃迁.对CS2+光解离动力学的研究表明,其产生S+的通道为:(i)CS2+吸收一个光子从基态2Πg共振激发至2Πu态,(ii)已布居的2Πu态的振动能级和2Πg态的高振动能级产生耦合,(iii)吸收第二个光子从上述耦合的振动能级进一步激发至2Σu+态,再通过2Σu+态与4Σ-态间的自旋-轨道相互作用,经由4Σ-排斥态解离产生S++CS.
关键词:  CS2+  光解离  光碎片激发
DOI:10.1088/1674-0068/14/4/389-396
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