摘要
所谓的喇曼光性(ROA)是指手性分子对于左右圆偏振光,具有很小差别喇曼散射截面(10^(-4))的现象。测量这种微小的差别的实验技术目前已有所发展,近年傅立叶喇曼光谱技术迅速发展提示我们思考傅立叶喇曼旋光实验的可能性,在此,我们将应用傅立叶振动圆二色性中的有关概念来探讨实现傅立叶喇曼旋光实验技术的可能性。
Raman Optical Activity(ROA) is a property of chiral molecules that refers to the different scattering cross sections to the right and left Circularly polarized light, The recent development of this technique along with the FT-Raman instrumentation stimulates our consideration of the plausibility of the FT ROA technique. In this presentation, the idea in the FT-IR circular dichroism in employed to analyze this plausibitity. Suppose a light beam is right and left circularly polarized, alternatively, with frequency fm and their corresponding Raman intensities I_R, I_L are written as: I_R(v)= I_O 10^(-A_R(v)); I_L(v)=I_O10^(-A_L(v)), where I_O is the intensity of the scattering laser. Our analysis shows that the ratio of the Fourier transforms of the direct to alternating signals of the scattering intensity is: exp(-2vυτ), tanh(1/2 ln10) ΔALR. Here ΔA_(LR) is defined as AL-AR with V the ve- locity of the moving mirror of the interferometer,τthe time constant and v the wavelength of the spectrum. The pro-factor ofΔA_LR can be estimated to be 0.0686-0.2278 which is not too small. This implies that ΔA_LR can be obtained with accuracy. Besides theoretical analysis, the instrumental factors will also be discussed.
出处
《光散射学报》
1991年第1期7-13,共7页
The Journal of Light Scattering
