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冲击相干振动光谱是以脉冲宽度比分子振动周期短的飞秒激光作为激发光源的一种光谱学实验方法,通常是以泵浦-探测实验装置为基础,可以实时观测与电子基态或激发态相耦合的分子振动动力学过程.中国科学院物理研究所以小于20fs,550～700nm光谱范围内可调谐的非共线光参量放大器为光源,建立了一套冲击相干振动光谱学实验装置,并以染料分子Oxazine720的甲醇溶液为样品进行了实验测试.实验中样品被泵浦光脉冲激发后在电子基态形成振动波包,并观测到振动波包在电子势能曲面上运动所形成的振动量子拍信号.经分析有两个分子振动模式被激发,其振动频率分别为592与678cm-1,所对应的振动周期分别为56.3与49.2fs.
Shock-coherent vibration spectroscopy is a spectroscopic experimental method using a femtosecond laser whose pulse width is shorter than the molecular vibration period as an excitation light source. Usually, it is based on a pump-probe experimental apparatus and can observe in real time whether the ground state or the excited state Coupled molecular vibrational dynamics process.Chinese Academy of Sciences Institute of Physics less than 20fs, 550 ~ 700nm tunable non-collinear optical parametric amplifier within the spectral range as the light source, set up a set of impact coherent vibration spectroscopy experimental device, and the dye molecules Oxazine720 methanol solution was used as an experimental sample.Experimental results show that the sample is pulsed by pump light to form a vibrating wave packet in the ground state of the electron and observes the vibrating quantum signal formed by the vibration wave packet moving on the electron potential surface. Analysis of two molecular vibration modes is excited, the vibration frequency of 592 and 678cm-1, respectively, corresponding to the vibration period of 56.3 and 49.2fs.