四氯化碳费米共振的拉曼光谱研究  

Study of the Raman Spectrum of CCl_4 Fermi Resonance

作　　者：高淑琴[1] 贺家宁[1] 李荣福[1] 左剑[1] 李兆凯[1] 曹彪[1] 里佐威[1] 

机构地区：[1]吉林大学物理学院,吉林长春130023

出　　处：《光谱学与光谱分析》2007年第10期2042-2044,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(10774057)资助(10774057)

摘　　要：费米共振现象是一种广泛存在于分子振动光谱中的现象,特别是结构比较复杂的多原子分子。在多原子分子中当振动倍频或组合频位于某一基频附近,由于发生振动耦合,会出现两个新峰,峰的位置向两侧发生移动,二者谱线强度发生变化,把这种现象称为费米共振。费米共振现象不仅存在于红外光谱中,也存在于拉曼光谱中。文章中测量了CCl4的拉曼光谱,利用所得到的谱线峰位和用Originpro7.5软件程序获得积分强度,用费米共振的相关理论计算了C-Cl的a1对称伸缩振动频率ν1与C-Cl2的f对称弯曲振动频率ν4的组合频(ν1+ν4)与(某一未知基频)C-Cl的f对称伸缩振动频率ν30的费米共振特征参数,进而计算出了耦合系数W和这一未知基频ν30。该文对理解费米共振,了解分子振动频率,研究分子结构有很重要的参考价值。Fermi resonance is a very common phenomenon in molecule vibration spectra, especially in polyatomic molecule with complex structure. Fermi resonance appears when a fundamental vibration frequency lies closely to an overtone or combination frequencies. One can observe two peaks coming from Fermi resonance and the energy transfer also occurs between the two peaks. Fermi resonance phenomenon appears in both infrared spectrum and Raman spectrum. The Raman spectrum of CCl4 was measured. The frequency separation between the two peaks in a Fermi resonance doublet was observed and the integrated intensities were calculated with the software of Origin Pro 7. 5. Fermi resonance interaction was caused by the CCl4 C-C1 f-symmetrical stretching fundamental v3 coupling. The combination frequency（vi ＋v4 ）of C-Cl a1-symmetrical stretching v1 and band C-Cl2 fsymmetrical bending v4 was calculated. Based on Bertran＇s theory, Fermi coupling coefficient W was calculated and the theoretical value v3 of v3 was estimated. The present article provided good reference for better understanding of the relationship between molecular vibration frequency and molecular structure.

关 键 词：费米共振 积分强度 拉曼光谱 

分 类 号：O657.3[理学—分析化学]