Quantum radial distribution functions of nondegenerated fluids

The paper is devoted to the problem of a classical limit in quantum statistical physics. A method is formulated based on algebraic calculation of qUantum-field radial distribution functions. It is shown that the formal condition to quasi-classical description is a factorization of the statistical operator. It is the initial approximation. Quantum exchange corrections of two types are obtained. Direct exchange correction falling exponentially as intermolecular distance R is increased. Indirect exchange corrections are proportional to lambda3 (lambda-thermal wavelength). If R>>lambda indirect corrections dominate