Semiclassical representation method in statistical physics of interacting molecules

Abstract

Abstract The description of the method of transition from the quantum-statistical theory of interacting subsystems to a semi-classical one is given, using interacting molecules as an example. The kinetic equation for the distribution function of the classical subsystem, i.e., a translational motion of molecules which interacts with a quantum subsystem, namely, the internal motions of the molecules, is derived. The physical interpretation of the classical intermolecular potential and the origin of irreversibility of translational motion of molecules are discussed.