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(基态)和S1/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.
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.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2012年第11期2543-2548,共6页
Acta Physico-Chimica Sinica
基金
supported by the National Natural Science Foundation of China (91121006)~~
关键词
光电子影像
超快过程
内转换
2-氯吡啶
Photoelectron imaging
Ultrafast process
Internalconversion
2-Chloropyridine
