Analytical Dielectric Spectrum Formula Based on Representative Frequencies  

基于代表性频率的介电谱解析形式

作　　者：孔博[1] 傅克祥[2] 单敏华[1] 李象远[2] 

机构地区：[1]四川大学物理学院,成都610065 [2]四川大学化工学院,成都610065

出　　处：《Chinese Journal of Chemical Physics》2009年第3期262-268,339,共8页化学物理学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China （No.20533070 and No.20873087）.

摘　　要：According to experimental data available for the complex refractive index of particular dielectrics, a dielectric spectrum formula is proposed by the least square fitting technique combined with selected natural frequencies. From the dielectric spectrum formula, the spectra of optical and dielectric constants can be obtained in the whole frequency region. Three dielectrics, water, ethanol, and toluene, are taken as examples. In the region where the ex- perimental data are available, the spectra of the optical constants calculated by the formula are in good agreement with the real refractive spectrum obtained by Kramers-Kronig （K-K） transform and the experimental imaginary refractive spectrum. In the region where no ex- perimental data are available, the extrapolation of our formula can make predictions. The merits of the present treatment are that we are able to get the uniform spectrum formula, without splitting into different frequency sections, and the analytical form of the dielectric spectra will be useful in the theoretical description of solvation dynamics.

关 键 词：FREQUENCY Least square fitting technique Dielectric spectrum Optical constant POLARIZATION 

分 类 号：O482.4[理学—固体物理] TN949.11[理学—物理]