CS_2在C_6H_6中的弱费米共振特性及对Bertran公式修正  

Amendment to bertran equation and the weak Fermi resonance characteristic of CS_2 in C_6H_6

作　　者：曹彪[1] 左剑[1] 里佐威[1] 欧阳顺利[1] 高淑琴[1] 陆国会[1] 姜永恒[1] 

机构地区：[1]吉林大学超硬材料国家重点实验室,长春130023

出　　处：《物理学报》2009年第5期3538-3542,共5页Acta Physica Sinica

基　　金：国家自然科学资金(批准号:10774057)资助的课题~~

摘　　要：通过测量CS2在C6H6中不同浓度的拉曼光谱,观察到了纯CS2与溶液中的v1—2v2费米共振明显不同.用Bertran方程,计算了费米共振特性参数.结果表明,随着CS2浓度降低,两光谱强度比R=Iv1/I2v2减小,耦合系数W增加,其他参数Δ,K122等也发生相应变化.分析表明这是由于CS2的v01谱线的散射系数随在C6H6中浓度变化所致.实验中还观察到v10和2v20谱线并非对称移动.对Bertran理论进行了修正,使其可以更好地解释这种弱费米共振(两费米共振峰非对称移动).对溶液分子谱线认证和使用费米共振微观理论有参考价值.The Raman spectra of CS2 in C6H6 is messured and the Fermi resonance of v1--2v2 in solution and in pure CS2 is obvionsly different. The characteristic parameters are calculated by Berttern equation. It was found that with the concentration of CS2 declining,the ratio of the spectral intensity （ R = 1653/1796 ） decreases and the coupling coefficient （W） raises, and the other parameters also change correspondingly. The analysis shows that dissipation coefficient of v1^0 of CS2 is affected by the concentration of C6 H6. Asymmetric frequency shift of v1^0 and 2v2^0 are observed in experiment, which is explained by amending the Bertran theory. This report has reference value for the molecule spectrum certification and the understanding and use of Fermi resonance theory.

关 键 词：拉曼光谱 费米共振 溶剂效应 二硫化碳 

分 类 号：O561.3[理学—原子与分子物理]