Dipole–Dipole Interaction of Substitutional Impurity Molecules in Crystals

Abstract

AbstractA theory is given of effective dipole—dipole interactions between two identical substitutional guest molecules at large intermolecular distance. An interaction theory for interstitial impurity molecules was developed in [3]. A two‐level scheme for the guest and host molecules is assumed. Local field corrections are discussed. It is shown that the dipole—dipole interaction of the guest molecules in a crystal is the interaction of the effective dipole moments. The values of such effective dipole moments differ from their values in vacuum by a factor which is expressed both by the dielectric constant at the impurity transition frequency and the microscopic characteristics of the medium.