A phenomenological theory of light scattering by surfaces is presented. The differential intensity of the scattered light is found in terms of autocorrelation functions characteristic for the distribution of matter in the surface layer. Local field factors are found.

If in Heisenberg's equations of motion for a problem in quantum mechanics (or quantum field theory) one studies matrix elements in the energy representation and by use of completeness conditions expresses the equations solely in terms of matrix elements of the canonical variables, and if one...

The linear laws pertaining to viscous phenomena are derived for a relativistic plasma in an electromagnetic field. The results found in this microscopic context fit precisely into the general scheme obtained on a macroscopic level by Hooyman, de Groot and Mazur.

We study the time evolution of a large system consisting of two kinds of particles that can be transformed into each other by an external field. The introduction of strong enough two-body interactions leads to the emergence of two time scales. The first one is connected with (small) asymptotic...

It is shown that the dynamics of a compressible, viscous classical fluid can be brought within the scope of the mixed canonical-dissipative formalism proposed previously as a tool of describing randomly driven systems. The Fokker-Planck equation for compressible fluids is derived and the...

A simple sum over paths will be considered for the general nonlinear diffusion process described by complex coordinates. In order to derive the corresponding stochastic differential equation the Feynman method used in quantum mechanics will be generalised for the present case of a coordinate...

The fluctuation of the intensity of superradiant pulse is calculated by applying a general asymptotic evaluation method of quantal macrovariables to a superradiant master equation. It is shown that the fluctuation of superradiant intensity is proportional to the cube of the number of the...

We are concerned with the phase transition behaviour of the cooperative Jahn-Teller T-e system and the T-t system in a simple cubic lattice. High temperature series expansions are derived for the specific heat and the elastic constants. In the latter case the symmetry has to be broken by...