Migration of a one-photon packet in a periodically deformed lattice
Migration of a one-photon packet in a periodically deformed lattice
V. Busek (Czechoslovakia)
A microscopic quantum-field description is used in considering the evolution of a one-photon wave packet in a periodically deformed lattice. The Ewald-Oseen theorem is proved for this case.
Show AbstractResonant interaction between an incident electron and an oxygen molecule adsorbed on an oxidized metal
Resonant interaction between an incident electron and an oxygen molecule adsorbed on an oxidized metal
G.G. Fedorov
The interaction between an electron and an adsorbed oxygen molecule is discussed. A mechanism is proposed for this interaction that explains the peak on the electron-stimulated desorption at an electron energy of 13 eV.
Show AbstractDetermining charged-particle concentrations from the ion current to a cylindrical probe in a weakly ionized low-pressure plasma
Determining charged-particle concentrations from the ion current to a cylindrical probe in a weakly ionized low-pressure plasma
A.P. Ershov, A.A. Kuzovnikov, B.N. Krasheninnikov
An experimental study has been performed on the applicability of collision-free theories of the ion current to a Langmuir probe over a wide range in the ratios of the radius of the probe to the Debye screening radius $\xi = R/\lambda_D$, and also over wide ranges in the ion mean free path $\lambda_i$ and in the ratio of the probe length L to the radius of the spacecharge layer s:
$(10^{-2}
Saturated coherent Raman scattering spectroscopy for molecular gases
Saturated coherent Raman scattering spectroscopy for molecular gases
V.N. Zadkov, N.I. Koroteev, M.V. Rychev, A.B. Fedorov
This paper discusses saturation of a Raman-scattering transition by biharmonic pumping waves, with probing by coherent anti-Stokes Raman scattering ASRS. It is shown that oscillations in the population difference on this transition at the difference frequency between the pumping and probe waves causes the shape of the homogeneous line for the ASRS signal to contain a characteristic feature: a dip with width determined by the time $T_1$. The results are extended to the case of a Doppler-broadened line. There is a discussion of the scope for coherence spectroscopy free from Doppler broadening.
Show AbstractTheory of fast adiabatic transit through resonance
Theory of fast adiabatic transit through resonance
Yu.S. Konstantinov
An exact solution is found for the transit through resonance in a spin system described by Bloch equations for $T_1=T_2=T$ with a special form for the external fields. It is shown in particular that one can obtain an inversion in the magnetization vector on rapid transit through resonance with comparatively weak HP fields if the nutation frequency for the magnetization vector is equal to twice the frequency of the external-field vector rotation in the rotating coordinate system.
Show AbstractConversion of a planar gravitational wave in a Coulomb field
Conversion of a planar gravitational wave in a Coulomb field
V.I. Denisov
The paper discusses the interaction of a planar elliptically polarized gravitational wave with the electric field of a particle at rest. The calculation is based on exact allowance for the delay in two cases: in vacuum and in matter whose refractive index is different from one. It Is shown that the interaction produces an electromagnetic wave of finite intensity, but the total intensity of the emission in all directions increases logarithmically with the distance because of the coherent character of the interaction. Allowance for the refractive index of the medium and for other perturbations that disrupt the соherence condition leads to a finite value for the total intensity.
Show AbstractDirect photoionization and the structure of the helium continuum
Direct photoionization and the structure of the helium continuum
S.M. Burkov, S.I. Strakhova
The strong-coupling approximation for four open channels has been used to calculate the К electron scattering matrix for $Не^+$ and the direct photoionization cross section for helium in the region above threshold. The channel-coupling effects are discussed together with the influence of the He ground-state function on the direct photoionization cross section. The calculations are compared with experiment and with other calculations.
Show AbstractNonlinear capillary-wave interaction in a liquid
Nonlinear capillary-wave interaction in a liquid
N.I. Pushkina
Nonlinear capillary-wave interaction in liquids is considered. Some spatial characteristics of the interaction have been established. An expression is derived for the threshold intensity of the parametric decay of the exciting capillary wave.
Show AbstractReduction processing and photonuclear reaction cross section estimation
Reduction processing and photonuclear reaction cross section estimation
V.V. Varlamov, B.S. Ishkhanov, Yu.P. Pyt'ev, A.P. Chernyaev, D.V. Yudin
A study is made of the possible reasons for systematic discrepancies between the cross sections of photonuclear reactions measured with continuous-spectrum $\gamma$ rays CG and quasimonochromatic $\gamma$ rays QMG. It is shown to be necessary to perform a full processing for the published QMG cross sections (which in essence are reaction yields) by analogy with what is done in CG experiments. It is proposed to use a reduction method for this additional treatment of the QMG cross sections that enables one to evaluate the quality of the CG and QMG data clearly and to combine the results from experiments of both types in the reduction scheme. This reduction processing has been carried out. for a series of measured cross sections for photoneutron reactions on $^{12}C$ and $^{18}O$. It has been found that the additional processing of the QMG cross sections leads to much improved agreement with the CG ones.
Show AbstractInterference reflectors at glancing incidence
Interference reflectors at glancing incidence
A.Yu. Klement'eva
The behavior of multilayer dielectric-reflecting systems is considered for angles of incidence of 85-90°, and types of system are identified that provide reflection coefficients close to one with extended reflection spectral ranges.
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