Rather approximations than solutions. I am looking for ab initio methods.rigetFrog said:I There are some nice analytic solutions, though only at some wavelengths.
Microscopic permittivity is a measure of the ability of a material to store electric charge when an electric field is applied. It is typically represented by the Greek symbol epsilon (ε) and is a fundamental property of materials that affects their electrical behavior.
The microscopic permittivity of a material can be calculated by dividing the electric displacement (D) by the electric field strength (E). This calculation can be expressed as ε = D/E. The units of microscopic permittivity are farads per meter (F/m).
Several factors can affect the value of microscopic permittivity, including the type of material, its physical structure, the presence of impurities or defects, and the temperature. In general, substances with higher dielectric constants tend to have higher microscopic permittivity values.
Calculating microscopic permittivity is important because it helps us understand how materials behave in the presence of an electric field. This information is essential for designing and optimizing electronic devices, as well as for studying the properties of materials in various fields of science and engineering.
Microscopic permittivity and macroscopic permittivity are closely related. Microscopic permittivity refers to the response of individual atoms or molecules to an electric field, while macroscopic permittivity refers to the overall response of a material made up of many atoms or molecules. In most cases, the value of macroscopic permittivity is equal to the average of the microscopic permittivity values of the individual components of the material.