分子费米共振拉曼光谱强度分析

Analysis of Spectral Intensity of Fermi Resonance of Molecules

测量了CCl_4和CS_2分子的Raman光谱。用Bertran理论和群论等相关理论对其光谱强度进行了分析,获得了发生费米共振分子的拉曼光谱强度的特殊规律:(1)发生费米共振的基频和倍频(和频)间发生能量转移,两光谱强度大小相互接近,当发生费米共振的基频和倍频(和频)间距离很小时,两发生费米共振的光谱强度相等(R=1);(2)能出现倍频光谱强度高于其基频光谱强度;(3)也会观测到费米共振光谱,而观测不到参与费米共振的和频中的基频光谱。此研究对化学、材料科学中的分子结构、材料成分等研究中的谱线认证、归属有很好的参考价值。

Raman spectra of liquid carbon disulfide （CS） and carbon tetrachloride （CCl4） were measured. And the spectral intensity was analyzed using the J. K Bertran theory and the group theory. The rule about Fermi resonance was obtained from the Raman spectra of carbon disulfide （CS） and carbon tetrachloride （CCl4） ： （1） The energy can transfer between a fundamental and an overtone frequency about Fermi resonance; the two spectra have the same intensity. The spectral intensity of the two spectra was equal （R= 1） about Fermi resonance, when the difference between fundamental of Fermi resonance and overtone of Fermi resonance was very small. （2） The intensity of overtone is stronger than that of fundamental＇ s. （3） The spectrum of Fermi resonance was observed, but the fundamental frequency was not. This article has very good reference value for the assignments in the molecular structure and the research of contents.