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
This paper reports low-temperature measurements of electroluminescence and current-voltage behavior in beta silicon carbide light-emitting diodes fabricated from phosphorus-doped cubic SiC with fused platinum and boron contacts. At 77 K, the diodes show pronounced brightness hysteresis, with two obs…
This paper examines how radiation affects the motion of high-energy electrons in accelerators and clarifies the relation between classical radiation reaction and quantum descriptions of photon emission. Using a quasiclassical quantum-electrodynamic treatment of magnetic bremsstrahlung, the authors d…
This paper analyzes contraction of a cylindrical gas discharge in the volume regime, where electron diffusion to the walls is neglected relative to ionization and recombination. Using coupled energy balance equations for electrons and neutral gas, a Saha relation for electron density, and specified …
The paper addresses the time dependence of the macroscopic magnetic moment of a paramagnet in a prescribed time-dependent magnetic field. Using Robertson’s projection-operator scheme for nonequilibrium statistical mechanics, the authors formulate exact integro-differential equations for magnetizatio…
This paper examines nonlinear instability of homogeneous magnetization precession in ferromagnetic resonance when both shape anisotropy and cubic crystallographic anisotropy are included, without restricting the precession angle to be small. Starting from the Landau-Lifshitz equation with damping an…
The paper extends magnetic-translation symmetry from the nonrelativistic charged particle to the Dirac equation for a relativistic charged particle in a uniform magnetic field. It shows that the corresponding unitary magnetic-translation operators commute with the Dirac Hamiltonian and, using the sq…
The paper studies resonant transfer of optical excitation in collisions of identical heavy one-electron atoms, with particular attention to the case where fine splitting of the excited P state is large. Using a semiclassical straight-line collision model and dipole-dipole interaction, it derives cou…
The paper analyzes induced one-quantum transitions of a relativistic electron in a homogeneous constant magnetic field under interaction with a plane monochromatic electromagnetic wave. Using exact electron wave functions with spin projection fixed along the magnetic-field direction, it derives matr…
This paper examines how hydrostatic compression affects the luminescence decay time of europium benzoylacetonate, focusing on the rare-earth ion transition from the excited state to the split ground multiplet. The authors argue that pressure can increase the probability of normally parity-forbidden …
This paper studies a one-dimensional nonlinear model of firehose instability in an anisotropic plasma with finite ion Larmor radius effects included in magnetohydrodynamic equations. For a circularly polarized monochromatic perturbation, the authors derive an analytic nonlinear solution in which the…
The paper studies how to assign mathematical meaning to the infinite Feynman diagram series for the coefficient functions in the normal-product expansion of the scattering matrix for a real scalar field with quartic interaction. It derives two systems of relations for these functions in the Euclidea…
This paper develops a perturbation theory for two-time retarded spin Green’s functions arising in the calculation of kernels for integro-differential equations describing the macroscopic magnetic moment of a paramagnet in an external magnetic field. Under high magnetic-temperature assumptions, fixed…
This paper derives generalized kinetic equations for quantum systems with separated relaxation time scales using the nonequilibrium statistical operator formalism associated with Zubarev and McLennan. For a Hamiltonian split into an unperturbed part and a small interaction, the argument expresses th…
This paper examines how nonanalytic temperature dependence associated with phase transitions can arise from exact thermodynamic Green functions in a nonrelativistic system of interacting Bose or Fermi particles. Using Schwinger equations, functional integrals over external fields, and path integral …
This paper develops a kinetic theory treatment of transport phenomena in reacting gas mixtures when inelastic, reaction-producing molecular collisions occur with frequencies comparable to elastic collisions. Starting from the Boltzmann equation with separate elastic and reactive collision terms, it …
This paper analyzes emission regimes in a gas laser with a rotating ring resonator, focusing on how counterpropagating waves interact through resonator scattering, spatial modulation of the active medium, unequal losses, and multimode effects. Using coupled amplitude and phase equations for the trav…
This paper reports experimental studies of optical activity in the infrared region of vibrational transitions, a spectral range in which such effects had received little prior theoretical or experimental attention. The authors measured rotatory dispersion in three dithionate crystals, SrS2O6·4H2O, C…
The paper determines the widest local Lie groups of point transformations admitted by homogeneous wave equations for zero mass fields, focusing on the Dirac, Maxwell, and weak gravitational field equations. Using the standard infinitesimal Lie method, it shows that the space-time part of the admitte…
The paper develops a nonlinear theory of stimulated light scattering in the Stokes wing of the Rayleigh line, attributed to the orientation of anisotropic molecules in strong optical fields. It derives coupled Maxwell equations for laser, Stokes, and anti-Stokes waves, obtains exponential gain in th…
The paper develops a computational method for determining angular wave numbers of normal waves in spherically layered anisotropic media by recalculating a matrix impedance operator. Starting from Maxwell’s equations, it derives a Riccati-type sweep equation for the impedance matrix and formulates th…
The paper relates Thirring’s quasispin model to a broader class of exactly solvable model Hamiltonians previously studied by the author using the method of approximating Hamiltonians. It shows that, with suitable choices of the collective spin operators and free part of the Hamiltonian, Thirring’s H…
This paper investigates the polarization of stimulated emission from glycerol and alcohol solutions of the organic dyes cryptocyanine and AlCl PhC under polarized ruby laser excitation. The authors combine experiments with a two-level molecular model to derive the angular dependence of the gain coef…
This paper examines the Townsend ionization coefficient in helium when indirect ionization by excited helium atoms is included, motivated by evidence that reactions involving the metastable or excited state He may supply electrons more effectively than direct electron impact under some conditions. T…
This paper examines the mechanism responsible for anomalously high photovoltage in CdTe films, a phenomenon previously interpreted mainly through a series of microscopic p-n junctions or through diffusion, Dember, processes. The authors argue that earlier criteria based on sign inversion with illumi…
This paper examines electromagnetic properties of superconductors with strong electron phonon coupling, motivated by materials such as lead, mercury, gallium, niobium nitride, and bismuth films for which weak coupling theory is insufficient. Using thermodynamic Green functions in a magnetic field an…
This paper develops a theoretical description of nonstationary crystal growth from a melt under nonisothermal conditions, combining heat removal through the growing solid with the physicokinetics of two-dimensional nucleation at the crystallization front. Starting from the Becker-Döring and Zel’dovi…
This paper examines vibrational excitation and relaxation of diatomic molecules in atom, molecule collisions, using classical trajectory calculations for oxygen, argon interactions with varied intermolecular potentials, molecular orientations, impact parameters, relative energies, and initial rotati…
This paper examines whether polarization measurements in elastic electron proton scattering can improve determination of the proton charge form factor at large momentum transfer, where unpolarized cross sections are dominated by the magnetic form factor. Using Born approximation formulas for recoil …
This note proposes a theoretical interpretation of a previously observed simple spectral regularity in meson, meson and meson, baryon resonant states, expressed through the variable defined by the squared resonance mass minus the squared masses of the two decay products. It argues that, under a cros…
This paper examines how contact with a metal modifies the energy spectrum of a dielectric, particularly the narrowing of the forbidden band near the interface. Using an equilibrium energy-balance argument that includes image forces and the macroscopic electric field, it derives distance-dependent ex…
This paper investigates how constant and pulsed electric fields affect latent photographic images in type-P nuclear emulsions previously exposed to charged particles. Emulsion layers were placed between plane electrodes and subjected to fields from 10^3 to 8 x 10^5 V/cm, followed by conventional dev…
This paper examines whether the internal energy of a solid in a nonequilibrium process may depend not only on temperature but also on the rate of temperature change. A phenomenological linear model is proposed and tested by applying short electrical heating pulses to copper specimens while independe…
This paper examines penetration of a quasistationary traveling electromagnetic field into a conducting plasma layer when the Hall term in Ohm’s law makes the skin effect nonlinear. The authors formulate the field and current equations in a moving reference frame and propose an iterative harmonic met…
This paper examines whether the shapes of the copper X-ray emission LII and LIII bands can be used to characterize the occupied 3d states in the conduction band. The authors calculate the LIII emission band by the cellular method, including transition probabilities and symmetry components of the val…
This paper investigates the time characteristics of continuous CaF2:Dy2+ laser generation under axial and angular mode selection, with the aim of testing whether a spikeless single mode regime can be obtained. Using resonators with external mirrors or coatings on the crystal ends, the authors measur…
The paper reports measurements of the spectral dependence of photo-emf in purified thin anthracene single crystals using transparent SnO2 electrodes and high-resistance electrometric detection. In the fundamental absorption region the photo-emf has the sign associated with hole conductivity, but at …
This paper examines the debated origin of the K beta 5 x-ray emission line in 3d metals, especially whether it reflects 3d states, 4p states, or hybridized band contributions. The authors estimate dipole and quadrupole transition probabilities using matrix elements for 3p to 1s and 3d to 1s transiti…
This paper examines the origin of multiplet structure in quasilinear spectra of organic molecules in frozen n-paraffin matrices, questioning whether such multiplets can be explained solely by distinct spatially separated emitting centers. Fluorescence and absorption spectra of free phthalocyanine an…
The paper examines the statistical description of a crystal particle localized near a lattice node within the self-consistent-field approximation. Starting from the relation between one-particle and binary distribution functions, it argues that the usual multiplicative approximation must be suppleme…
The paper reports ultrasonic measurements of longitudinal and transverse sound velocities in polycrystalline silver chloride under pressures up to 100 kbar at room temperature. Using a high pressure piston apparatus with external quartz transducers and pressure calibration by reference metal transit…
This paper examines the origin of complex infrared absorption bands in sodium nitrate, especially whether they should be attributed to librations of nitrate ions or to combinations of internal and external lattice vibrations. Polarized infrared spectra of oriented single crystals were measured from …
The paper investigates how the energy spectra of secondary ions depend on scattering geometry when molybdenum single crystal faces are bombarded by low energy heavy cesium ions. Measurements for the Mo(100) surface at varying incidence angles are compared with elastic collision calculations for sing…
This paper analyzes the current-voltage characteristic of electron emission from a semiconductor into a dielectric, motivated by experimental observations of cubic current laws in semiconductor-dielectric structures. The authors argue that such behavior need not be attributed solely to trap filling …
This paper develops a formulation of crystal optics that includes the magnetoelectric effect, allowing the electric and magnetic inductions to depend linearly on both electric and magnetic fields. It derives tensor restrictions from energy conservation and absence of absorption, decomposes the magne…
The paper studies spherically symmetric sound waves in a medium interacting with its own gravitational field within a Riemannian, relativistic hydrodynamic framework. It formulates the governing equations for velocity, specific volume, entropy, and metric functions, recovers the Oppenheimer Volkov e…
This paper examines classical statistical mechanical systems whose energy is not conserved because external generalized forces act on the particles. Starting from non-Hamiltonian equations of motion, it derives a generalized Liouville equation and identifies a phase-space divergence condition as the…
This paper derives homogeneous but fully anisotropic cosmological solutions of the Einstein equations for a flat three-space filled with ideal matter in a comoving synchronous frame. Using scale factors along three spatial axes and the metric determinant, the analysis reduces the field equations for…
This paper investigates the tetragonal luminescence center of Eu3+ ions in CaF2, motivated by the need to distinguish rare-earth centers with different charge-compensation mechanisms and laser properties. Using pulsed-excitation luminescence kinetics, spectral grouping by build-up times, selection r…
The paper examines whether magnetic fields can be spontaneously excited in a plasma with intense Langmuir turbulence, extending ideas known for turbulent conducting fluids. Using a kinetic treatment that separates turbulent and regular components, it derives a turbulent dielectric tensor for low-fre…
