SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25357 full-text translations 14926 English PDFs 22539 abstracts
Showing 50 of 2226 papers in Physics
The study examines the valence-band structure of p-type indium arsenide using infrared reflection and absorption spectra for zinc-doped single crystals with hole concentrations from 1.6 x 10^17 to 4.9 x 10^19 cm^-3 at 300 and 100 K. Plasma minima in reflection spectra were used to estimate averaged …
This paper develops a theoretical treatment of plane harmonic Rayleigh waves propagating along the surface of a cadmium sulfide crystal bordering vacuum, with piezoelectric coupling, finite conductivity, and electron diffusion included. Starting from the elastic, piezoelectric, Poisson, current, and…
This paper examines the spectroscopic and laser properties of Nd3+ activated LiNbO3 crystals, a nonlinear optical material considered as a potential host for optical quantum generators. Using absorption, luminescence, and stimulated emission measurements at 77 K and 300 K on Czochralski-grown polydo…
This paper analyzes energy losses in quantum generators based on organic dye solutions, extending earlier calculations for monochromatic pumping by including absorption from excited states to higher electron-vibrational levels. A rate-based model is developed for a transverse generator to estimate p…
This paper examines whether the nonequilibrium statistical operator method can describe nonlinear relaxation processes far from equilibrium, using energy exchange between two dilute gases at substantially different temperatures as a test case. A stationary nonequilibrium statistical operator is cons…
This paper examines whether meson current algebra can be derived within a definite composite-particle model rather than assumed as a postulate. Using the model of free effective quarks, it constructs nonrelativistic and relativistic matrix elements of internal meson currents, applies Markov-Yukawa c…
This paper develops a quantum mechanical formulation for low energy scattering processes with rearrangement, where the kinetic energy of outgoing fragments is small relative to excitation energies of higher internal states. Using projection operators onto a finite set of bound internal states, the a…
This paper examines the convergence and applicability of perturbation theory for calculating nonlinear polarization in resonant media, especially in the theory of optical quantum generators. It formulates a diagram technique for higher order terms of the one-particle density matrix and applies it to…
This paper gives a functional formulation of Bogolyubov’s axioms for a causal S-matrix theory in quantum field theory, restricted for simplicity to a single self-interacting real scalar field. It formulates the general structure in terms of rigged Hilbert spaces, nuclear Fock spaces, Poincaré invari…
This paper reports measurements of ultrashort pulse characteristics in mode-locked optical quantum generators based on neodymium glass and ruby. Pulse durations were determined by an optical coincidence method using the enhanced two-photon-excited luminescence produced when counterpropagating pulses…
This paper examines a newly observed high pressure phase transition line in triglycine selenate, supplementing earlier dielectric studies that showed the pressure dependence of its ferroelectric transition. Differential thermal analysis with a copper constantan thermocouple and cerium reference was …
This paper examines how to determine the number of consecutively connected microphotocells in CdTe anomalous photovoltage films and evaluates the inadequacy of an earlier junction-based logarithmic relation for this purpose. Using measured photovoltage as a function of illumination intensity, the au…
This study examines electron paramagnetic resonance in oxide glasses containing copper and cobalt transition ions, using borate, silicate, and phosphate glass systems with varying CuO and CoO contents. EPR spectra measured at room, liquid nitrogen, and helium temperatures show that isolated Cu2+ ion…
This paper analyzes how resonant transfer of excitation in collisions of identical atoms can change the electron spin direction and thereby alter the hyperfine state of an atom. Using the dipole interaction between atoms in ground s and excited p states, it argues that at low nuclear velocities the …
This paper examines the calculation of molecular exciton energies in molecular crystals, focusing on the effect of electronic polarizability from molecular states not explicitly included in standard dipole interaction treatments. Using an isotropic molecular crystal as a model, it shows that the tra…
This paper reports the realization and analysis of three-beam electron interference in a UEMV-100 electron microscope using an electrostatic prism with two metallized quartz filaments. The authors derive intensity and visibility expressions for equal and unequal virtual-source geometries, compare th…
This paper experimentally compares the interaction of ultrasonic surface waves and bulk longitudinal and transverse waves with conduction electrons in a CdS crystal. Using pulsed 30 MHz ultrasound, variable photoconductivity produced by white and spectrally filtered illumination, and measurements of…
Spectral and temporal characteristics of lasing in a CaF2:Sm2+ crystal excited by a ruby laser were investigated at low temperatures. Using prism and high dispersion spectrographs together with nanosecond oscillographic recording of selected spectral components, the study follows how emission change…
The paper treats ultrasound absorption by conduction electrons in a metal under a strong quantizing magnetic field, where the classical Boltzmann equation is no longer applicable. It formulates a relaxation-time density-matrix description that preserves gauge invariance through a locally equilibrium…
This paper examines the temperature dependence of the first magnetic anisotropy constant in single-crystal ferrites with spinel structure in relation to spontaneous saturation magnetization. It notes that the classical tenth-power law predicted for cubic crystals is not generally supported by experi…
This paper examines how the luminescence quantum yield of neodymium glass affects the energy efficiency of stimulated emission in optical quantum generators. The authors measured total and 1.06 micrometer band luminescence yields for Nd3+ glass with 2 percent and 6 percent activator concentrations u…
This paper determines the maximum obtainable work from an isolated thermodynamic system consisting of a heat source and a refrigerator with finite heat capacities. Using Gibbs’ principle and heat balance relations for continuous sequences of cycles, it compares co-current and counter-current heat ex…
This paper derives equations for electromagnetic fields and general electromagnetic potentials in homogeneous anisotropic media with an arbitrary complex permittivity tensor. Using algebraic elimination for Maxwell’s equations with constant coefficients, it shows that each field component satisfies …
This study examines whether bulk pure nickel can acquire field-induced uniaxial magnetic anisotropy when its structure is made closer to that of thin ferromagnetic films by severe plastic deformation. Nickel foil reduced by 99 percent rolling was annealed in a 6000 Oe magnetic field at different tem…
The paper examines the connection between Bohm’s stability criterion for the near-wall plasma layer and the excitation of ambipolar sound in the positive column of a gas discharge in a magnetic field. It argues that violation of the Bohm condition, interpreted as the ambipolar diffusion velocity at …
This paper analyzes the local expansion of the two-electron atomic wave function near the triple-collision point by introducing a perturbation parameter for the electron-electron interaction. Using Fock’s hyperspherical formulation, it derives perturbation equations for the expansion coefficients an…
This paper investigates the frequency dependence of two-photon absorption in CdS near the fundamental absorption edge at room temperature. The experiment used a Q-switched neodymium glass laser as a monochromatic source and a pulsed xenon lamp with a continuous spectrum, measuring attenuation of sel…
This paper reports an experimental study of two-photon absorption in CaF2 crystals doped with trivalent holmium ions, motivated by the narrow rare-earth energy levels and the parity-allowed character of optical two-photon electric-dipole transitions. Using ruby and neodymium-glass lasers, the author…
This paper studies homogeneous axisymmetric cosmological solutions of the Einstein and Maxwell equations for a perfect fluid with the ultrarelativistic equation of state e equals 3p, extending earlier work on dustlike matter. For vanishing magnetic field, parametric solutions are derived and classif…
This paper addresses the long-standing discrepancy between theoretical predictions and experimental observations of the energy dependence of polarized radiation from atoms excited by electron impact, especially the near-threshold decrease of polarization. It proposes a semiclassical explanation base…
This paper examines whether holograms can be recorded when the radiation scattered by an object and the reference beam have different wavelengths and therefore do not satisfy the usual phase coherence condition. Using a Gabor-type wave-optical treatment, the authors show that direct photographic rec…
This paper studies exact wave functions for elementary particles of arbitrary spin in the field of a plane electromagnetic wave, a case in which the relativistic wave equation reduces to dependence on the phase of the external wave. Using the minimal equation for the particle matrices and a projecti…
This paper examines electroacoustic phenomena in solids for the simple case of one type of charge carrier with a parabolic electron spectrum, focusing on high ultrasonic frequencies where standard phenomenological relations may fail. Using the kinetic equation for electrons interacting with a monoch…
This study examines gas discharge parameters relevant to population inversion in argon ion optical quantum generators operated in continuous and pulsed regimes. Charged particle concentrations were estimated photographically from Stark broadening of hydrogen Balmer lines, with instrumental and Doppl…
This paper analyzes temperature Green’s functions and elementary excitations in a weakly nonideal Bose gas, with attention to whether an additional collective spectral branch exists in the weak-coupling limit. Using perturbative secular equations for small interaction strength, it shows that the pro…
The paper examines whether angular measurements of light scattered by liquids can be used to investigate acoustic properties at sound frequencies of about 10^8 to 10^10 Hz. It argues that the adiabatic compressibility contributing to scattering by density fluctuations should be treated as dependent …
This note studies the completeness of perturbation theory scattering amplitudes, viewed as holomorphic functions of the cosine of the scattering angle in Lehmann ellipses, within a Hilbert space of square integrable functions and within a space of amplitudes. For nonrelativistic Yukawa scattering an…
This paper reports electron paramagnetic resonance studies of vanadium and chromium ions isomorphously introduced into calcium fluoride crystals grown from fluorine-saturated melts. The spectra identify two vanadium centers: an isotropic center assigned to V3+ and an axially symmetric center assigne…
This paper examines whether thermally induced deformation, usually a source of increased resonator loss in solid-state optical quantum generators, can instead be used to raise the Q-factor of a neodymium-glass laser resonator. The authors measure threshold pumping, generation power, and diffraction …
This paper examines the propagation and self-focusing of axially symmetric wave beams in weakly nonlinear media, starting from the paraxial nonlinear wave equation with a field-dependent dielectric permittivity. By expanding the logarithm of the field amplitude in powers of the transverse radius, th…
This paper investigates the acoustoelectric effect in CdSe under conditions where an electron drift stream continuously amplifies an ultrasonic wave. A theoretical expression is derived for the acoustoelectric current and open-circuit emf in a piezosemiconductor using the longitudinal dielectric per…
This paper gives a rigorous formulation and solution for diffraction of an obliquely incident plane electromagnetic wave by two coaxial perfectly conducting circular disks in a homogeneous medium. Using electric Hertz vectors and separation of variables in oblate spheroidal coordinates, the scattere…
This study investigates hyperfine interactions and electronic spin relaxation of Fe57 impurity nuclei in the ferromagnetic compounds MnSb and CrTe below and near their Curie temperatures using Mössbauer spectroscopy. Samples containing 5 at.% iron were prepared by diffusion, and spectra were measure…
This study investigates nuclear resonance fluorescence from highly excited states of nickel-62, cadmium-114, and lead-208 using gamma rays produced by thermal neutron capture in iron and a self-absorption method for determining radiative widths. Measurements of scattered gamma spectra, temperature e…
This paper examines the massless two-dimensional Thirring model, focusing on the relation between the Glaser and Berezin construction in an auxiliary field space and ordinary perturbation theory in the physical Fock space. It compares the different contraction rules and current commutators in the tw…
The paper studies general analytic properties and solution methods for equations of the Chu-Low type arising in pion scattering by a fixed source under unitarity and crossing symmetry. By transforming the spectral variable to linearize the unitarity condition, the scattering functions are treated as…
Thermal conductivity in sodium chloride single crystals was measured at helium temperatures to examine phonon scattering by dislocations, point defects, and crystal boundaries. Using a steady-state heat-flow method, specimens with dislocation densities from 5 x 10^4 to 5 x 10^7 cm^-2 were studied be…
This paper reports experimental measurements of the azimuthal magnetic field and inferred current distribution in a quasi-stationary coaxial plasma injector operated with millisecond discharge pulses in nitrogen. Using probe coils and Rogowski belts, the authors mapped averaged current lines for dif…
This paper analyzes thermodynamic properties of a two-band superconductor with overlapping energy bands near the Fermi surface in the presence of a small concentration of nonmagnetic impurities. Using temperature Green’s functions and impurity-averaged self-energies, it derives equations for the ban…
This paper analyzes the conditions for unidirectional generation in a gas traveling-wave laser when four waves can oscillate at two frequencies, with counterpropagating waves allowed at each frequency. Using Lamb’s density-matrix method without the usual approximation that the cavity mode spacing gr…
