四氢呋喃(THF)非共振拉曼光谱中反对称散射的贡献  

The Antisymmetric Nonresonant VibrationalRaman Scattering of Tetrahydrofuran

作　　者：李莉[1] 何天敬[1] 王秀燕[1] 刘凡镇[1] 左健[2] 许存义[2] 

机构地区：[1]中国科学技术大学化学物理系 [2]中国科学技术大学结构研究开放实验室

出　　处：《Chinese Journal of Chemical Physics》1997年第2期124-132,共9页化学物理学报（英文）

基　　金：国家自然科学基金

摘　　要：研究了四氢呋喃（ＴＨＦ）非共振拉曼光谱中反对称散射的贡献。在测量ＴＨＦ的非共振拉曼带的退偏比时发现，准转动式环折迭振动带及其组合带ｖ１６、ｖ１７虽是全对称振型，但其退偏比ρ约０．７５，远大于其它普通全对称振动带的退偏比。从时间反演对称性和空间对称性分析证明，反对称极化率张量不为零，进一步估计其大小比对称部分小一个量级（或同量级）。反对称散射的重要贡献是ｖ１６、ｖ１７振动带大退偏比的重要原因。Antisymmetric nonresonant vibrational Raman scattering of Tetrahydrofuran (THF) is experimentally and theoretically studied in this paper.In nonresonant Raman spectra of THF,the depolarization ratios of totalysymmetric combinative bands (v 16 and v 17 ) related to the pseudorotation have been found to be ρ～0.75,far higher than those of ordinary totalysymmetric vibrational bands.By using a time-reversal symmeetry and group theory theoretical results show that the amti symmetric transition polarizabilities make important comtribution to the higher depolarization ratios of ν 16 and ν 17 bands,and become 1 order of magnitude smaller than or as same order of magnitude as the symmtric ones.

关 键 词：四氢呋喃 非共振拉曼光谱 反对称散射 分子光谱 

分 类 号：O561.3[理学—原子与分子物理]