二维凝聚体系中单轴取向分子的偏振Raman散射强度

分析了薄膜体系几种常用测量坐标下的偏振Raman散射强度表达式,发现当测量坐标与膜坐标重叠对,各种偏振Raman散射强度只需用膜坐标中的Raman散射活性来表达。如果这两个坐标不重叠,需进一步求出膜坐标中Raman张量元二次交叉项的平均值。本文给出了单轴唯一角取向模型下这些二次交叉项的平均值表达式及取向分布模型下膜坐标中所有Raman张量元二次项平均值。

Polarized Raman Scattering Intensities of Uniaxially Oriented Molecules in Two-dimensional Condensed System

In usual measure coordinates, the four kinds of polarized Raman scattering intensities for ultrathin films can be expressed only by the Raman scattering activities of the membrane coordinate if the measure coordinates are overlapped with the membrane coordinate. Otherwise, the average values for the quadric cross terms of Raman tensor elements in the membrane coordinate may appear in some intensity expression. In the article, these average values were given under the uniaxially oriented model with a fixed angle. And all of the average values of quadric terms of Raman tensor elements in the membrane coordinate were giien under uniaxial orientation distribution model.