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Analytical Dielectric Spectrum Formula Based on Representative Frequencies
Bo Kong,Ke-xiang Fu,Min-hua Shan,Xiang-yuan Li*
Author NameAffiliationE-mail
Bo Kong College of Physics, Sichuan University, Chengdu 610065, China  
Ke-xiang Fu College of Chemical Engineering, Sichuan University, Chengdu 610065, China  
Min-hua Shan College of Physics, Sichuan University, Chengdu 610065, China  
Xiang-yuan Li* College of Chemical Engineering, Sichuan University, Chengdu 610065, China xyli@scu.edu.cn 
Abstract:
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 experimental 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 experimental 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
Key words:  Frequency, Least square fitting technique, Dielectric spectrum, Optical con-stant, Polarization
FundProject:
Analytical Dielectric Spectrum Formula Based on Representative Frequencies
孔博,傅克祥,单敏华,李象远*
摘要:
基于电介质复折射率的实验数据,采用最小二乘法结合选取的代表频率拟合得到了电介质的介电谱解析表达式,可以得到电介质在全频段的光频常数和介电常数. 研究了三个典型液态电介质,水、乙醇和甲苯的介电谱. 在实验数据可以获取的频率范围内,采用解析表达式得到的光频常数与采用Kramers-Kronig转换得到的折射率实部和实验得到的折射率虚部吻合得很好. 基于介电谱解析表达式可以预测目前实验无法测量的区域的介电谱.
关键词:  频率,最小二乘拟合,介电谱,光学常数,极化
DOI:10.1088/1674-0068/22/03/262-268
分类号: