V.A. Mikhailov, Y.I. Odintsov

The spectral distribution and the intensity of induced three-photon scattering near the 5$^2$S$_{1/2}$—5$^2$P$_{1/2,3/2}$ resonance transitions of the rubidium atom upon excitation of a narrow (0.2cm$^{-1}$) frequency-tuned pumping line with intensities up to 30 MW/cm$^2$. The forced three-photon scattering was observed in the form of a wide asymmetric line. A much slower intensity falloff was always observed from the edge of the line, removed from resonance ω$_{0}$ frequency of the atomic transition. The highest-energy pulse due to induced three-photon scattering was attained upon long-wave divergence between pumping frequency ω$_{L}$ and the resonance frequency, i.e., ω$_{0}$-ω$_{L}$~1-4cm $_{-1}$. The dependence of the shift of the maximum of the line of induced three-photon scattering on ω$_{0}$-ω$_{L}$. It is shown that the location of the maximum and the intensity distribution of the induced three-photon scattering line are in satisfactory agreement with theoretical estimates, making allowance for the shift of atomic levels as a result of Stark's dynamic effect.

V.I. Grinev, V.F. Кiselev

Adsorption of hydrogen atoms on a real surface of a germanium monocrystal vacuumed at 700°K results in a significant rise in the monotonic component of the surface recombination rate at virtually unchanged capture of. charge carriers onto fast surface states. The quasicontinuous spectrum of recombination nuclei is independent of the spectrum of fast states.

A.Kh. Matutes, N.A. Khatanova

It was found in investigating of the structural states in austenitic Fe alloys with 19% Ni and 10% Ru; 27% Ni and 2% Ru, and in an 34.4% Ni with FCC lattices that particles of a solid Fe-Ru solution in NiO form in the course of electrical polishing. No such particles were observed in a Fe alloy with 20% Ni, which has an α phase structure with a BCC lattice. The formation of the(Fe, Ru, Ni)0 particles is attributed to penetration of oxygen atoms into the austenite lattice.

O.N. Melnikova

A. Wague, P.В. Ivanov, V.S. Senashenko, E.Yu.Cherkashin

The diagonalization technique is employed for calculating the excitation energies and the widths of self-ionization $^1$Р$_{1}^{(-)}$ and $^3$Р$_{1}^{(-)}$ states of Fe$^{24+}$ ions, converging to the n = 2 threshold of the residual ion. The calculations were performed with allowance for the spin-orbital interaction, and also in the LS coupling approximation. It is seen by comparing our results with calculations which included Breit's complete operator that in calculating the widths of self ionization levels of helium-like iron ions in the intermediate coupling approximation one can restrict himself to only the single-particle operator of the spinorbital interaction. Here allowance for configuration mixing with respect to the principal quantum number results in only insignificant changes in the excitation energies and width of the self-ionization levels under study.

V.V. Кislov

An algebraic classifcation of electromagnetic fields based on investigating characteristic λ matrices for field tensor F$_{μν}$ is considered. A Petrov-Penrouse type diagram for electromagnetic fields is constructed. An analogy between certain exact solutions for the gravitational and electromagnetic fields is examined.

Ya.I. Grayevskаya, A.P. Zvyagina, V.I. Iveronova

A.G. Мirопоv

The density of energy states and number of states in the zones in the case of a spectrum symmetric relative to electrons and holes are computed in a two-zone model generalized by taking into account the influence of remote zones. Numerical estimates of the density of states in the case of energies at a distance from the zone edges of approximately the width of the forbidden zone are presented, and may markedly differ from the results of Cain model; the difference in the electron concentration is less substantial.

N.F. Nelipa, A.E. Pukhov

The process of multiple generation of particles in nucleus-nucleus collisions is considered within the framework of a model of independent collisions. Formulas are obtained which express the mean multiplicity of particles generated in nuclear collision in terms of the mean multiplicity of pA interactions.

V.K. Grishin, S.Т. Ivanov, M.F. Kanevskii

The state of a wave beam in an unbounded plasma which appears at the stage of wave capture and particle phase mixing is analyzed. The mean state is described by means of nonlinear kinetic, self-consistent equations, and the plasma remains a linear, dispersing medium. Equations are obtained which describe the nonlinear state of a wave beam, by means of which it is possible to obtain detailed information about the characteristics of the particular system.