Density dependence for the dielectric permittivity of simple gases and liquids

The present work is devoted to the analysis of polarization effects in atomic systems of the argon type. Special attention is given to the manifestation of the polarizabilities of two particles in the density dependence of the dielectric permittivity of a system and its effective molecular polarizability. It is shown that the effective polarizability of a molecule in the liquid state of a system is mainly caused by deviation of the molecular distribution in the first coordination layer from the spherical one. Due to this, the atomic polarizability inherent to rarefied gas increases practically twice near the triple point. The interconnection between the atomic polarizability and the proper volume of an atom is discussed in detail. It is established that the optimal size of an atom follows from the kinematic shear viscosity measurements. •The analysis of previously ignored polarization effects in atomic systems such as argon.•The manifestation of two-particle polarizability depending on the dielectric constant of the system.•The deviation of the first molecular coordination layer from the spherical one determines the permittivity.•The approach can change the understanding of the dielectric properties of systems more complex than argon.