We propose a self-consistent model taking into account variations in adsorption properties of the adsorbent surface in the process of adsorption-desorption of molecules of gas on it. We introduce a dimensionless coupling parameter that characterizes the interaction of an adsorbed molecule with polarized medium. It is established that the system can be bistable if the coupling parameter is greater than a critical value and the concentration of gas belongs to a certain interval. We show that the adsorption isotherms obtained within the framework of the proposed model essentially differ from the Langmuir isotherms and establish that the Zeldovich hysteresis is possible. The kinetics of the surface coverage is analyzed in detail. We show that taking account of variations in adsorption properties of the surface in the process of adsorption-desorption leads to new phenomena: a "quasistationary" state in the case of the overdamped approximation and damped self-oscillations of the system in the general case.

In Section 1 of the present paper we obtain the kinetic Enhanced fluctuations in semi-infinite plasmas.

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The general electromagnetic solution of the set of Maxwell-Boltzman equations is obtained for the case of semi-infiite multicomponent plasma at the assumption that (i) the random scattering of charged particles at the boundary takes place and (ii) the full particle flow is convserved in the process of scattering. The dielectric response function and the correlation functions for microcurrents have been found for such a plasma system and the relation between these functions has been written in the form of a generalization of the fluctuation-dissipation theorem. As the applications of these results to the investigation of physical phenomena the reflection of a plane wave from the plasmadielectric interface and the spectrum of excitations in a plasma with random scattering boundary were considered.

The test charge problem for a semi-infinite plasma is formulated. Expressions for the far field potential are derived for stationary and slowly moving test charges. By applying the superposition principle for uncorrelated dressed test particles we calculate the dynamic form factor as well as the energy spectrum of the spontaneous radiation field.