物理化学学报 >> 2014, Vol. 30 >> Issue (1): 2222-27.doi: 10.3866/PKU.WHXB201311122

热力学,动力学和结构化学 上一篇    下一篇

飞秒时间分辨的光电子影像对3-甲基吡啶分子超快动力学研究

布玛丽亚·阿布力米提1,2,3, 朱荣淑1, 邱学军2,3, 秦晨2,3, 张冰2,3   

  1. 1 哈尔滨工业大学深圳研究生院, 环境科学与工程研究中心, 广东深圳 518055;
    2 中国科学院武汉物理与数学研究所, 波谱与原子分子物理国家重点实验室, 武汉 430071;
    3 中国科学院大学, 北京 100049
  • 收稿日期:2013-08-29 修回日期:2013-11-12 发布日期:2014-01-01
  • 通讯作者: 朱荣淑,张冰 E-mail:rszhu@hitsz.edu.cn;bzhang@wipm.ac.cn
  • 基金资助:

    国家自然科学基金(91121006,21273274)资助项目

Studies of Ultrafast Dynamics of 3-Picoline with Femtosecond Time-Resolved Photoelectron Imaging

ABULIMITI Bumaliya1,2,3, ZHU Rong-Shu1, QIU Xue-Jun2,3, QIN Chen2,3, ZHANG Bing2,3   

  1. 1 Environmental Science and Engineering Research Center, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, Guangdong Province, P. R. China;
    2 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China;
    3 University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2013-08-29 Revised:2013-11-12 Published:2014-01-01
  • Contact: ZHU Rong-Shu, ZHANG Bing E-mail:rszhu@hitsz.edu.cn;bzhang@wipm.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (91121006, 21273274).

摘要:

利用飞秒时间分辨的光电子影像技术结合时间分辨的质谱技术,研究了3-甲基吡啶分子激发态的超快过程. 实时观察到了3-甲基吡啶分子S2态向S1态高振动能级的超快内转换过程,该内转换的时间大约为910fs. 二次布居的S1态主要通过内转换衰减到基态S0,该内转换的时间尺度为2.77 ps. 光电子能谱分布和光电子角分布显示,S2态和S1态在电离的过程中跟3p里德堡态发生偶然共振. 本次实验中还用400 nm两个光子吸收的方法布居了3-甲基吡啶的3s 里德堡态. 研究表明,3s 里德堡态的寿命为62 fs,并主要通过内转换快速衰减到基态.

关键词: 甲基吡啶, 光电子影像, 内转换, 泵浦-探测, 时间分辨光谱

Abstract:

The ultrafast dynamics of excited states in 3-picoline were studied using femtosecond timeresolved photoelectron imaging, coupled with time-resolved mass spectroscopy. An ultrafast internal conversion from the S2 state to the vibrationally excited S1 state in about 910 fs was observed. This secondary-populated S1 state further deactivates to the S0 state in 2.77 ps. The photoelectron energy and angular distributions show ionizations from the singlet 3p Rydberg states. Two 400 nm photon excitations to the 3s Rydberg state suggest that this state probably decays to the ground state in 62 fs.

Key words: Picoline, Photoelectron imaging, Internal conversion, Pump-probe, Time-resolved spectroscopy

MSC2000: 

  • O644