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.
The ultrafast dynamics of excited states in 3-picoline was studied using femtosecond time- resolved photoelectron imaging, coupled with time-resolved mass spectroscopy. An ultrafast internal conversion from the $2 state to the vibrationally excited St state in about 910 fs was observed. This secondary-populated S1 state further deactivates to the So 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.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2014年第1期22-27,共6页
Acta Physico-Chimica Sinica
基金
The project was supported by the National Natural Science Foundation of China(91121006,21273274)~~
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
Picoline
Photoelectron imaging
Internal conversion
Pump-probe
Time-resolved spectroscopy