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It is known that during gas-phase epitaxy of InP and GaAs the region of the film close to the heteroboundary is formed with altered phase, structural, and electrophysical properties. The main cause for this is formation of a transition layer due to a change in the growth mechanism (transition from nucleational to layer-step growth) and the structure of the growing surface (height and density of growth steps).

A new approach to the selection of high-frequency oscillations generated in high-voltage glow discharge plasma is developed. It is based on the appearance of pressure pulsations arising during collisions of the inflowing working gas stream with an obstacle. A spatial inhomogeneity in concentration of high-voltage glow discharge plasma (14 kV and 30 mA) caused by pressure pulsations results in discharge combustion instability. The difference between the ignition and combustion voltages of the discharge provides the ionization processes as well as the high-frequency (HF) oscillations at a frequency of 5 MHz selected by an oscillatory circuit. The fraction of power transformed into HF-oscillations reaches 40%. Testing of this oscillator in etching of a lithium niobate crystal demonstrates that the surface charges are removed from the substrate not only by the plasma, but also by displacement and recharge currents. An etching rate of 5 μm/h has been achieved.

Using the Laplace transform of Boltzmann's equation, a system of linking equations is obtained for the series expansion of the mapping of the distribution function in powers of the field. Since the form of the equations is identical, instead of direct integration it is possible to use the method of Green's functions for the solution of the system. Using the method of perturbances Green's resolvent is constructed in the form of an infinite series. Using the example of the evaluation of the distribution function in a high-frequency field, the convergence of the proposed method is demonstrated.

All isotropic conformally Steckel metrics are derived that satisfy the Einstein vacuum equations containing a Λ term and do not reduce to the purely Steckel type. The metrics allow the integration of the Hamilton-Jacobi equation for a massless particle by complete variable separation.

The physical and mathematical features of exact solutions of the problem of an electron moving in the field of a quantized, plane electromagnetic wave [1–4] are investigated. In particular, the problem of constructing solutions for all values of the total energy of the system is solved. A new interpretation is given to the limiting approach to Volkov solutions [5, 6]. The completeness and orthogonality of the solutions are proven in the reference plane formalism. The notation of [4] is used in this paper.