CAJ | 학술논문

以飞秒400及266 nm激光脉冲结合泵浦-探测飞行时间质谱方法研究了苯S2态内转换动力学. 400 nm双光子过程将苯分子激发到S2电子态,布居在S2电子态的分子由于能级耦合无辐射弛豫到S1电子态. 通过测定C6H6+讯号强度随泵浦-探测延迟时间的改变,获得苯S2及S1电子态的衰减寿命分别为(48±1)fs及(6.5±0.2)ps, S2态及S1电子态的消激发机理被认为是相应势能面间的锥形交叉引起的内转换.
이비초400급266 nm격광맥충결합빙포-탐측비행시간질보방법연구료분S2태내전환동역학. 400 nm쌍광자과정장분분자격발도S2전자태,포거재S2전자태적분자유우능급우합무복사이예도S1전자태. 통과측정C6H6+신호강도수빙포-탐측연지시간적개변,획득분S2급S1전자태적쇠감수명분별위(48±1)fs급(6.5±0.2)ps, S2태급S1전자태적소격발궤리피인위시상응세능면간적추형교차인기적내전환.
The detection of benzene photoions in pump-probe experiments with the femtosecond laser pulse at 400 and 266 nm has allowed to study the dynamics of the internal conversion after excitation to the electronic S2 state. For the S2 state, an extremely short lifetime τD1=(48±1)fs has been obtained, whereas the lifetime τD2=(6.5±0.2)ps of the S1 state populated by the internal conversion from the S2 state is longer than that of the S2 state. The deactivation of the S2 state as well as the S1 state has been explained by the internal conversion to lower electronic states caused by the conical intersection of the corresponding potential surfaces.