利用光子回波研究尼尔蓝的电子态振动模式  

Electronic State Vibration Modes with Photon Echo in Nile Blue

作　　者：张中华[1] 陈佳[1] 夏元钦[1] 赵阳[1] 

机构地区：[1]哈尔滨工业大学光电子技术研究所,黑龙江哈尔滨150080

出　　处：《中国激光》2014年第3期230-235,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(11174068)

摘　　要：对样品分子建立多模布朗振动模型,分析了理论计算三脉冲光子回波信号强度的方法。以尼尔蓝分子为例,采用多模布朗振动模型来分析尼尔蓝分子的振动,将尼尔蓝分子的振动当作高斯型、过阻尼型、完全非均匀型、欠阻尼型这四种模式的加权耦合。改变四种振动模式的权重以改变尼尔蓝分子的相关函数,对三脉冲光子回波信号进行了数值模拟。以浓度为8×10-5 mol/L的尼尔蓝乙醇溶液为样品,波长为623nm、脉宽为40fs的飞秒激光为光源,进行了三脉冲光子回波信号的实验测量,研究了尼尔蓝分子的电子态振动模式。Multimode Brownian osicillater model of material molecules is set, and the method to calculate the three- pulse photon echo signal is discussed. The model of the Multimode Brownian oscillator is used to analyze the vibration of the Nile blue molecules and the vibration of the Nile blue molecules is regarded as the weighted coupling result of the Gaussian, overdamping, inhomogeneous and underdamping models. Changing the weight of these four models to alter the correlation function of the Nile blue molecules, we numerically simulate the three-pulse photon echo signal. Experiment about the three-pulse photon echo of the Nile blue ethanol solution is conducted. The concentration of Nile blue ethanol solution is 8× 10^- 5 mol/L, the wavelength and the pulse width of the femtosecond laser light source are 623 nm and 40 fs, respectively. The three-pulse photon echo signal is measured to discuss the vibration model of the Nile blue molecules.

关 键 词：测量 多模布朗振动 三脉冲光子回波 相关函数 飞秒激光 电子态振动模式 

分 类 号：O657.38[理学—分析化学]