物理化学学报 >> 2012, Vol. 28 >> Issue (11): 2543-2548.doi: 10.3866/PKU.WHXB201208135

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技术研究2-氯吡啶超快内转换动力学

GHAZAL Ahmed-Yousif, 邱学军, 秦朝朝, 龙金友, 布玛丽亚·阿布力米提, 张冰   

  1. 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; 中国科学院研究生院, 北京 100049
  • 收稿日期:2012-06-26 修回日期:2012-08-13 发布日期:2012-10-17
  • 通讯作者: 张冰 E-mail:bzhang@wipm.ac.cn
  • 基金资助:

    国家自然科学基金(91121006)资助项目

Ultrafast Internal Conversion Dynamics of 2-Chloropyridine by Femtosecond Time-Resolved Photoelectron Imaging

GHAZAl Ahmed-Yousif, QIU Xue-Jun, QIN Chao-Chao, LONG Jin-You, ABULIMITI Bumaliya, ZHANG Bing   

  1. 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; Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2012-06-26 Revised:2012-08-13 Published:2012-10-17
  • Supported by:

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

摘要:

利用时间分辨的飞秒光电子影像技术结合时间分辨的质谱技术, 研究了2-氯吡啶分子激发态的超快过程. 实时观察到了2-氯吡啶分子第二激发态(S2)向第一激发态(S1)高振动能级的的超快内转换过程,该内转换的时间常数为(162±5)fs. 实验结果表明, 通过S2/S0的锥形交叉衰减到基态的衰减通道也是退布居的重要通道, 其时间尺度为(5.5±0.3) ps.

关键词: 光电子影像, 超快过程, 内转换, 2-氯吡啶

Abstract:

Ultrafast internal conversion dynamics of 2-chloropyridine were studied by femtosecond time-resolved photoelectron imaging spectroscopy coupled with time-resolved mass spectroscopy. The ultrafast internal conversion from the second excited state (S2) to the first excited state (S1) via an adjacent conical intersection within (162±5) fs was clearly observed from the time-dependence of the photoelectron spectra. The subsequent deactivations involved the coupling of S2/S0 (the ground state) and S1/S0 conical intersections, which occurred on a timescale of about (5.5±0.3) ps, and led to the internal conversion to the ground state from the S2 and S1 states.

Key words: Photoelectron imaging, Ultrafast process, Internal conversion, 2-Chloropyridine

MSC2000: 

  • O644