N-乙基吡咯是吡咯分子的一个乙基取代衍生物，它的激发态衰变动力学目前为止很少被研究。在本文中，我们利用飞秒时间分辨光电子成像的实验方法研究了N-乙基吡咯分子S1态的衰变动力学。实验上采用了241.9和237.7 nm的泵浦激发波长。在241.9 nm激发下，得到了5.0±0.7 ps, 66.4±15.6 ps 和1.3±0.1 ns三个寿命常数。对于237.7 nm, 得到了2.1±0.1 ps 和13.1±1.2 ps两个寿命常数。我们将所有寿命常数都归属为S1态的振动态。并对不同S1振动态的弛豫机理进行了讨论。
N-ethylpyrrole is one of ethyl-substituted derivatives of pyrrole and its excited-state decay dynamics has never been explored. In this paper, we investigate ultrafast decay dynamics of N-ethylpyrrole excited to the S1 electronic state using a femtosecond time-resolved photoelectron imaging method. Two pump wavelengths of 241.9 and 237.7 nm are employed. At 241.9 nm, three time constants, 5.0±0.7 ps, 66.4±15.6 ps and 1.3±0.1 ns, were derived. For 237.7 nm, two time constants of 2.1±0.1 ps and 13.1±1.2 ps were derived. We assign all these time constants to be associated with different vibrational states in the S1 state. The possible decay mechanisms of different S1 vibrational states are briefly discussed.