【摘要】 本文根据分子晶体的特征,应用空间群商群与点群同形原理,并配合结构分析方法,直接对RbC_H5O₄晶体中的内振动模按不可约表示相容关系进行对称性分类。对振动光谱中出现的基频耦合和Fermi共振谱线,则按照分子中各功能团的空间相关位置和各基频直积表示的对称化进行分析确定。通过获得的三种同晶型晶体RAP,TAP和KAP喇曼散射谱的鉴别比较,从整个光谱中将晶格点阵振动外模式分离出来。更多还原

【Abstract】 Based on the feature of molecular crystal, we apply the theorem that the foctor group of the space group is isomorphic to the point group and combine with the method of structural analysis, to classify the modes of internal vibrations of RbC8H5O4 directly according to the compatibility relations of the irreducible representations. For spectra of the fundamental frequency coupling and Fermi resonance in vibration spectra, we have to make determination according to the space relative position of each functional group and symmetrization of each fundamental direct product representation. Raman scattering spectra of three kind of isomor-phous crystal (i.e, RAP, TAP and KAP) have been obtained and compared with each other. The modes of external vibrations in crystal lattice was then isolated from the overall spectra.更多还原