An exactly solvable model of a partially dissociated gas of homonuclear diatomic molecules is presented, and its thermodynamic properties are studied.

The Heisenberg ferromagnet with general spin S is considered within Green-function theory and spectral density method. New difference equations of the first order determining one- and two-particle correlation functions are derived and solved. The spectral density method is used to close Oguchi's...

In a recent formulation of the theory of the classical one-dimensional gas of hard rods with an interaction of finite range, the Gibbs potential and distribution functions are expressed in terms of the eigenvalue with the smallest absolute value and the corresponding eigenfunction of the...

A measure of unification is achieved for the purpose of analyzing the steady current flows through elongated cylinders of general section which are activated by a pair of small electrodes on the end faces and are relevant to a scheme of Kirchhoff for determining the electrical conductivity of...

In this paper a low-energy-electron diffraction theory for a molecular crystal is presented. The influence of the surface Frenkel excitons on the intensity of the (00) beam is studied for a crystal with a special structure. The general case will be treated in a subsequent paper.

We analyze the one-body propagator, describing formally the exact motion of one particle in a fluid, which plays an important role in the kinetic analysis of the long-time behavior of the Green-Kubo integrands, as presented in the two previous papers of this series. The non-uniform character of...

The plane Couette problem for a Knudsen gas of linear molecules is considered. The rotational degrees of freedom of the molecules are described through the internal angular momentum. An alignment of the molecules is produced by the orientation dependence of the interaction of the gas molecules...

We investigate some of the dynamic properties of diffusing particles described by a many-body Smoluchowski equation. The dynamic structure factor is expressed in terms of a memory function which is evaluated in the cases of i) weak interaction and ii) low particle density, but arbitrary...

The method of the tunneling Hamiltonian is reformulated in the case of normal tunneling by introducing two independent particle baths. Due to the baths, it becomes possible to realize a final stationary state where the electron numbers of the two electrodes in the tunneling system are maintained...

It is shown that a general Bogoliubov transformation can be used as an alternative to Gorkov's equations in studying the properties of superfluid 3He with a position-dependent gap matrix. Expressions are derived for the current density and the gradient free energy which are exact to first and...