One- dimensional hydrogen atom
One- dimensional hydrogen atom
V.В. Gostev, V.К. Peres - Fernandes, А.R. Frenkin, and G.А. Chizhov
The problem of nonrelativistic one-dimensional particle motion in а Coulomb attractive field which has been under investigation for а long time is subjected to examination. On the basis of the physical principles that the energy levels are independent of the choice of length scales, that there is no Clauder effect, and tbat there are no bound states in the repulsive field, а self-consistent expansion of the Hamiltonian of а one-dimensional hydrogen atom with uniquely de fined parity-nondegenerate levels and а stable ground state is found. New expressions are found for the even wave functions.
Show AbstractGround state of two- dimensional two-electron atomic systems
Ground state of two- dimensional two-electron atomic systems
V.V. Komarov, А.М. Popova, V.G. Airapetyan, and А.М. Gadzhiev
The spectral properties of the Schrodinger operator of two-dimensional two-electron atomic systems are investigated. Tirring estimates are obtained for the ground-state energy. Within the framework of the variational method and the Hylleraas method, the ground-state energy is calculated in the first and third approximations.
Show AbstractChange in emission properties of W- Re alloy after $\gamma$ irradiation
Change in emission properties of W- Re alloy after $\gamma$ irradiation
V.А. Mashtakova, Р.В. Ryaryaev, and А.А. Salomatin
In а cylindrical vacuum diode, emission properties of wires of W-Re alloy irradiated bу у quanta of energy 1.З MeV are investigated. It is shown that the work function determined Ьу the total-current method and the Richardson straight-line method is increased as а result of irradiation and further annealing.
Show AbstractElementary processes in photoionized- discharge plasma in nitrogen with additions of $NH_3$ and Хе
Elementary processes in photoionized- discharge plasma in nitrogen with additions of $NH_3$ and Хе
А.V. Zabolotnykh and V.В. Saenko
The plasmochemical processes and dynamics of plasma breakdown in а volume discharge initiated bу hard UV radiation are analyzed. Thanks to the use of high- energy radiatiori quanta, it is possible to broaden the choice of readily ionizaЫe impurities. It is shown that it is expedient to use NH_3 and Хе to excite quasi- continuous discharge in CO_2 and СО laser media, respectively. The necessary photoionization pulse- repetition frequency is determined.
Show AbstractStandard quantum limit in measuring small fo r ces using а tunnel sensor
Standard quantum limit in measuring small fo r ces using а tunnel sensor
V.Р. Mitrofanov and V.N. Yakimov
А device for recording srnall forces frorn the change in arnplitude of oscillator vibrations is analyzed; this change in amplitude is rnea-· sured bу rneans of а displacernent sensor based on the tunnel effect. The conditions of attainrnent of the standard quanturn lirnit for the rneasured force are deterrnined.
Show AbstractParametric video amplifier with frequency - selective no ise compression
Parametric video amplifier with frequency - selective no ise compression
А.V. Gusev and V.V. Kulagin
The quantum constraints on the sensitivity in а parametric video amplifier of reflective type with an additional element - а channel for forming an inverse wave in the compressed state - are investigated.
Show AbstractDouble acoustooptical Bragg scatter ing of light
Double acoustooptical Bragg scatter ing of light
V.В. Voloshinov, V.N. Parygin, and В. Traore
Experimental results are given on the conditions of anisotropic diffraction in the propagation of two acoustic waves of different fre quency in the same direction in а crystal. The dependence of the intensity of the Bragg maxima оп the amplitude and frequency of the acoustic waves is measured.
Show AbstractPhase modulation of pulses in dye lasers with synchronous pumping
Phase modulation of pulses in dye lasers with synchronous pumping
D.Р. Krindach and V.I. Novoderezhkin
Conditions of steady mode synchronization in dye lasers with synchronous pumping are investigated theoretically, taking account of phase modulation. Analytical solutions are obtained for the pulse length and the chirp par ameter with arЫtrary detuning of the wavelength relative to the center of the amplification line. The results of experimental investigation of the phase modulation and of in- resonator and extraresonator compensation of the chirp in а continuous dye laser are outlined.
Show AbstractModeling photosynthesis light curves
Modeling photosynthesis light curves
N.О. Belogrudov, V.А. Karavaev, and А.К. Kukushkin
On the basis of а model taking account of the features of the primary processes of photosynthesis, а theoretical description of the light curves of photosynthesis is developed. In model experiments, light curves are obtained for different values of the electron-transport rate constant and distributions of the absorbed light energy between photosystems. The results are discussed in connection with known experimental data.
Show AbstractFiber- optical sensor of spatial coherence of radiation
Fiber- optical sensor of spatial coherence of radiation
D.V. Baranov, М.I. Belovolov, I.V. Zhurilova, S.К. Isaev, А.Р. Kryukov, and А.V. Kuznetsov
А simple, compact sensor of spatial coherence based on а Y-type fiber directional coupler. The signal at the sensor output is created as а result of interference of the light beams captured Ьу the lightguide cores. The sensor permits spatial separation of the investigated plane of the beam and the recording apparatus, the use of electronic processing of the signal, and measurement of the radius of curvature of the laser-beam wavefronts.
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