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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.
The time-resolved femtosecond photoelectron imaging technique combined with time-resolved mass spectrometry was used to investigate the ultrafast process of 2-chloropyridine molecular excited states. The second excited state (S2) of 2-chloropyridine molecules was observed in real time to the first excited state (S1), the time constant of the internal transition is (162 ± 5) fs.Experimental results show that the taper crosses S2 / S0 (S1) and S1 / S0 to the ground state The attenuation channel is also an important channel to withdraw from the home. Its time scale is (5.5 ± 0.3) ps.