作　　者： ; ; ; ; ; ; ;

机构地区： 深圳大学光电工程学院光电子器件与系统教育部重点实验室

出　　处： 《光谱学与光谱分析》 2011年第2期314-318,共5页

摘　　要： 利用作者自制的超连续谱激发时间分辨相干反斯托克斯拉曼散射(coherent anti-stokes Raman scat-tering,CARS)谱仪同时测得反映分子组成的各种振动谱以及这些振动模式各自的退相时间。实验对苯甲腈样品分子振动谱中5个典型分子振动模式的振动弛豫过程进行了测量,一次获得了这种分子各振动模式对应的退相时间。在实验中发现苯甲腈苯环中的面内弯曲振动模中存在振荡衰减现象,这是由两个相邻简正振动模同时被激发并叠加而产生的。还对苯甲腈与无水乙醇混合后的三个更强的振动模的振动弛豫过程进行了测量,并得到了这种混合物的振动退相时间。这种方法具有检测样品自身特性和所处微环境变化的能力,在生物学、化学和材料科学等研究领域具有重要的应用前景。 In the present paper,the authors used the time-resolved coherent anti-Stokes Raman scattering（CARS） spectroscopy based on supercontinuum developed by ourselves to acquire simultaneously the molecular vibration spectrum and vibrational dephasing time of the molecular various vibrational modes.Using benzonitrile as the sample,the authors measured its vibrational relaxation processes at its five typical vibrational modes and obtained their vibrational dephasing time respectively.In the experiment,the authors also found the phenomenon that oscillations appear in the vibrational dephasing of plane bending vibration mode of benzene ring in benzonitrile,which was caused by superposition of the two adjacent normal vibrational modes excited simultaneously.After mixing benzonitrile with anhydrous ethanol,the authors also measured their vibrational dephasing time.This method is capable of monitoring the changes of the molecular characteristics and its micro-environment,therefore it will find widespread applications in biology,chemistry and materials science.

关 键 词： 相干反斯托克斯拉曼散射 时间分辨 分子振动光谱 振动退相时间

领　　域： [机械工程] [理学] [理学]