Sensibility to Changes of Vibrational Modes of Excited Electron： Sum Frequency Signals Versus Difference Frequency Signals  

作　　者：GU An-Na LIANG Xian-Ting 

机构地区：[1]Department of Physics and Institute of Modern Physics, Ningbo University, Ningbo 315211, China

出　　处：《Communications in Theoretical Physics》2011年第3期506-512,共7页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No. 61078065, Natural Science Foundation of Ningbo City under Grant No. 2008A61009, and K.C. Wong Magna Foundation in Ningbo University

摘　　要：In this paper, we investigate a two electronic level system with vibrational modes coupled to a Brownian oscillator bath. The difference frequency generation （DFG） signals and sum frequency generation （SFG） signals are calculated. It is shown that, for the same model, the SFG signals are more sensitive than the DFG signals to the changes of the vibrational modes of the electronic two-level system. Because the SFG conversion efficiency can be improved by using the time-delay method, the findings in this paper predict that the SFG spectrum may probe the changes of the microstructure more effectively.

关 键 词：difference frequency signals sum frequency signals response functions SUSCEPTIBILITY 

分 类 号：TN248.1[电子电信—物理电子学] TB853.29[一般工业技术—摄影技术]