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Studies of Photoionization of CF3 I by Femtosecond Time-resolved Mass Spectrometry
Yin Shuhui*,Liu Hongping,Zhang Jianyang,Jiang Bo,Wang Li,Sha Guohe,Lou Nanquan
Author NameAffiliationE-mail
Yin Shuhui* State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 yinshu@dicp.ac.cn 
Liu Hongping State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023  
Zhang Jianyang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023  
Jiang Bo State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023  
Wang Li State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023  
Sha Guohe State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023  
Lou Nanquan State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023  
Abstract:
The multi-photon dissociative photoionization dynamics of CF3I has been studied with femtosecond two-color pump-probe time of flight mass spectra at a pump pulse of 265 nm and a probe pulse of 398 nm. The life constants of CF3I+ and its fragment ions CF3+ and I+ are obtained as (96±7), (198±130) and (167±6)fs, respectively. The multi-photon dynamics leading to these ions differ. CF3I+ corresponds to a (1+2′) transition with one-photon pump excitation to the A band of CF3I. CF3+ are mainly formed by a tow-photon probe excitation to the CF3+ with subsequent dissociation of parent ions. I+ are produced in (2+2′) combined with (1+1′+2′) process. The results provide information on the multi-photon pathways involved.
Key words:  Femtosecond, Pump-probe, Photonionization, Lifetime
FundProject:国家自然科学基金(29833080, 29953001)资助项目.
飞秒时间分辨质谱方法研究CF3I光电离动力学
尹淑慧*,刘红平,张建阳,姜波,王利,沙国河,楼南泉
摘要:
利用飞秒双色泵浦-探测(pump-probe)飞行时间质谱方法研究了CF3I分子多光子电离动力学,所用泵浦光及探测光的中心波长分别为265和398 nm.获得了母分子离子CF3I+信号及其碎片离子CF3+和I+信号的寿命衰减常数分别为(96±7)、 (198±13)和(167±6)fs.这些离子产生的多光子通道机理不同: CF3I来自(1+2′)跃迁,单光子泵浦光与CF3I A带共振;驭光子泵浦光激发CF3I分子到5pπ7sδ(2Π1/2)里德伯态,单光子探测光电离产生的母分子离子解离产生CF3+; I+来自(2+2′)和(1+1′+2′)激发过程.
关键词:  飞秒  泵浦-探测  光电离  寿命
DOI:10.1088/1674-0068/16/1/3-8
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