高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (8): 1517.

• 研究论文 • 上一篇    下一篇

用超短脉冲激光研究1,3-二氯苯激发态动力学

王艳秋1, 袁丽威1, 王利1, 何国钟1, 张志刚2, 王清月2   

  1. 1. 中国科学院大连化学物理研究所, 分子反应动力学国家重点实验室, 大连116023;
    2. 天津大学精密仪器与光电子工程学院超快激光实验室, 天津300072
  • 收稿日期:2003-08-05 出版日期:2004-08-24 发布日期:2004-08-24
  • 基金资助:

    国家自然科学基金(批准号:20273072);国家重点基础研究发展规划项目(批准号:G1999075301)资助

A Study of Dynamics of Excited State 1,3-Dichrolobenzene with Ultrafast Pulse Laser

WANG Yan-Qiu1, YUAN Li-Wei1, WANG Li1, HE Guo-Zhong1, ZHANG Zhi-Gang2, WANG Qing-Yue2   

  1. 1. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
    2. Laboratory of Ultrafast Laser, College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
  • Received:2003-08-05 Online:2004-08-24 Published:2004-08-24

摘要: 利用啁啾脉冲放大技术建立了一套掺钛蓝宝石飞秒激光放大系统,该系统输出中心波长808nm,单脉冲能量8mJ,脉冲宽度60fs,脉冲重复频率20Hz.利用飞秒激光泵浦-探测及分子束技术,结合飞行时间质谱,对1,3-二氯苯分子的激发态动力学过程进行了研究,实验中观察到该分子能级间的量子拍频现象,并获得了第一单重激发态寿命及其拍频频率,阐述了飞秒激光场下间位二氯苯分子的电离解离机理.

关键词: 飞秒激光, 多光子电离, 飞行时间质谱, 激发态

Abstract: A new CPA femtosecond laser system was built up. The output of the system is centered at 808 nm with 8 mJ/pulse power and 60 fs pulse width at 20 Hz repetition rate. In this paper,we present the detail description of this femtosecond laser system and our initial experimental investigation of de-excited dynamics of 1,3-dichrolobenzene in its S1 excited state with the laser system,combined with the time-flight mass spectrometer,pump-probe technique and supersonic molecular beam. Quantum beat phenomenon of 1,3-dichrolobenzene in its S1 excited state was clearly observed for the first time in real time scale. The lifetime constant and the quantum beat frequency of S1 excited state were obtained. The photodissociation process of 1,3-dichlorobenzene is illuminated.

Key words: Femtoseocnd laser, Multiphoton ionization, Time-flight mass spectrometer, Excited state

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