摘要
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.
Impulsive coherent vibrational spectroscopy is a kind of time-resolved spectroscopy methodology with a pulse duration of the ferntosecond laser shorter than the molecular vibrational period. Usually, it is based on pump-probe technique and is utilized to real-time observation of the molecular vibrational dynamics coupled to the electronic ground or excited state. We have built an impulsive coherent vibrational spectroscopy setup based on a sub-20 fs, 550 to 700 nm tunable non-collinear optical parametric amplifier and performed pump-probe experiment with an Oxazine 720 methanol solution as the sample. Two vibrational quantum beats with frequency of 592 and 678 cm-1 were observed and the corresponding vibrational periods are 56.3 and 49.2 fs respectively.
出处
《科学通报》
EI
CAS
CSCD
北大核心
2012年第31期2895-2898,共4页
Chinese Science Bulletin
基金
国家杰出青年科学基金(20925313)
中国科学院知识创新工程重要方向项目(KJCX2-YW-W25)资助
关键词
振动波包
量子拍
冲击相干振动光谱
vibrational wave packet, quantum beat, impulsive coherent vibrational spectroscopy
