L.L. Balashova, Sh.N. Garin, A.I. Dodonov

The angular dependence of the intensity of fluxes of molecular and atomic nitrogen ions forcing in the reflecting of accelerated molecular nitrogen ions of energy 30 keV from the surface of polycrystalline copper is investigated. It is shown that the difference between the angular distributions of the molecular and atomic ions may be explained by the dependence of the degree of dissociation of the molecules on the scattering angle.

S.N. Kravchun, D.Ya. Pyasta

O.F. Dorofeev, V.N. Rоdiоnоv

On the basis of taking into account the interaction between a photon and a complex electromagnetic field consisting of a combination of the field of a wave and a homogeneous magnetic field, the process of e$^{-}$ e$^{+}$ pair formation is investigated. The case of the two-photon formation of an electron-positron pair with the propagation of photons in opposite directions in an external magnetic field H is analyzed In detail. A correction is obtained to the Breit-Uiler cross section in the limit H ≪H$_10$ ~ 10 $^{13}$ G. It is shown that the magnitude of this correction depends significantly on the energy of the interacting photons and changes sign at an energy h$_ω$ ~ 1,33 mc$^{2}$.

A.I. Osipov, P.A. Tadzhibaev

Based on a solution of the Fokker-Planck equation, the distribution function of the translational energy is solved for a Rayleigh gas with sources of heavy particles. The nature of disturbances in the equilibrium distribution function caused by the source of the particles is analyzed.

G.A. Bendrikow, L.D. Lozinskii

The article presents a generalization of the root locus method to the class of linear self-regulating systems containing not only elements described by ordinary differential equations with constant coefficients, but also an element described by a one - dimensional heat conduction equation.

G.A. Сhуzhоv, O.F. Dorofeev

Coherent - oscillator radiation is considered. A comparison is made with the radiation of a classical particle, and an estimate is given for the decay probability of the coherent state in the process of spontaneous emission.

L.M. Vоlкоva, A.M. Devуatоv, V.Kh. Fazlaev

The formation of Sr$^+$ and Ва$^+$ ions in a cooled hollow cathode in a discharge filled with argon and helium is investigated. The concentration of Sr$^+$ and Ва$^+$ ions is determined from the measured absorption coefficients of their resonance lines and also from the solution of the balance equation.

I.P. Bazarov, P.N. Nikolaev

On the basis of expansion in powers of a small parameter, the chain of Bogolyubov equations for the crystal state is solved. Ah expression is obtained for the s-particle distribution function up to second order, inclusive.

A.G. Вelоv, E.P. Rashevskауa

A contactless nondestructive method of determining the concentration of free charge carriers in PbTe and Pb$_{0,8}$ Sn$_{0,2}$Te from the IR reflection spectrum in the wavelength range 20-120 microns is proposed. Theoretical calibration curves are constructed, allowing the charge-carrier concentration in PbTe at T = 300 and 80 К and in Pb$_{0,8}$ Sn$_{0,2}$Te at T = 80К to be determined from the position of the point of inflection of the spectral dependence of the reflection coefficient on the light wavelength. The error of the metod is estimated, and shown to be no more than ±30%.

V.M. Zakhartsov

The angular distribution of neutrino pairs emitted by a relativistic electron moving in a magnetic field is considered. It is shown that the particles are emitted predominantly in the opposite direction to the magnetic field. This asymmetry directly reflects the nonconservation of spatial parity in the given process. On account of radiation reactive forces, the electron is accelerated in the direction of the magnetic field. Expressions are obtained for the asymmetry parameter of the radiation and the radiation reactive force, depending both on the magnetic field strength and the electron energy and on its polarization.