New equation for calculating electronic polarizability using refractometry

Abstract

The determination of the electronic polarizability of molecules is carried out by quantum-mechanical, refractometric and spectrometric methods. Refractometry is the simplest and most reliable method, since to determine the values of the electronic polarizability, it is required to have data on the absolute refractive index, substance density (molar volume) and the theoretical relation relating these parameters to electron polarizability. The Lorentz-Lorenz equation is currently used as such a relation. In this paper the justification of the new equation for determining the electronic component of the isotropic polarizability of molecules is given. From the experimental data on the density and absolute refractive index of a substance, the values of the average electronic polarizability of 62 different molecules were determined. The calculation was performed for the condensed state of a substance at 293.15K.