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1
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Hydrogen-Like Excitations of 3d and 4f Isoelectronic Impurities in Semiconductors

100%
Sokolov V.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
245-256
EN
In the paper the energy states of structured isoelectronic impurities of transition metals and rare earth elements, donor and acceptor excitons of 3d and 4f impurities, the role of donor and acceptor excitons of 3d and 4f impurities in energy transfer from the matrix to impurities are discussed. It is shown that structured impurities may be classified as "open" and "closed" isoelectronic impurities. The number of electrons in the 3d or 4f shells is changed at hω < E_{g} not changed structure levels generated by forbidden gap properties donor acceptor excitons those energy transfer mechanisms from matrix to an impurity (a capture carriers into 3d or 4f shells open and auger process essentially distinguished two kinds structured isoelectronic for closed impurities a model is discussed in frame which the spectra of electroabsorption photoluminescence cathodoluminescence are described.
2
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Neutron Resonances: Widths Distribution versus the Porter-Thomas Law

100%
Sokolov V.
Acta Physica Polonica A
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2017
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vol. 132
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issue 6
1704-1706
EN
The neutron resonance scattering off heavy nuclei is a paradigmatic example of the chaotic processes that are well described within the framework of the standard Random Matrix Theory (RMT). In zero approximation of non-overlapping resonances, the resonance width distribution is given by the standard Porter-Thomas law (PTD) dw/dx= e^{-x/2}/√(2πx), where x=Γ/⟨Γ⟩ is the resonance width measured in the units of its mean value. We analyze the influence of the resonance overlapping and show that the experimentally observed deviations from of the PTD arise due to the influence of a moderate number of neighboring resonances located inside a restricted energy interval within which the mean level spacing D remains constant.
3
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Elastic Enhancement Factor: Mesoscopic Systems versus Macroscopic 2D Electromagnetic Analogue Devices

63%
Sokolov V., Zhirov O.
Acta Physica Polonica A
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2015
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vol. 128
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issue 6
990-993
EN
Excess of probabilities of the elastic processes over the inelastic ones is a common feature of the resonance phenomena described in the framework of the random matrix theory. This effect is quantitatively characterized by the elastic enhancement factor F^{(β)} that is the typical ratio of elastic and inelastic cross-sections. Being measured experimentally, this quantity can supply us with information on specific features of the dynamics of the intermediate complicated open system. We discuss properties of the enhancement factor in a wide scope from mesoscopic systems to macroscopic analogue electromagnetic resonators and demonstrate essential qualitative distinction between the elastic enhancement factor's peculiarities in these two cases. Complete analytical solution is found for the case of systems without time-reversal symmetry and only a few open equivalent scattering channels.
4
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Interaction of Excitons Bound to 3d Transition Metal Ions with Lattice Vibrations in II-VI Semiconductors

63%
Sokolov V., Surkova T.
Acta Physica Polonica A
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1991
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vol. 79
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issue 1
155-157
EN
The analysis of an interaction of bound excitons with lattice vibrations for ZnO:Ni and ZnO:Cu is given on the basis of symmetry consideration.
5
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Modeling of fluid flow in microgap considering the boundary change of dynamic viscosity

51%
Sokolova Y., Rasskazova Y., Krol O., Sokolov V.
Teka Commission of Motorization and Power Industry in Agriculture
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2016
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vol. 16
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issue 2
6
Content available remote

Energy States of Ni in Zn_{1-x}Mn_{x}Se:Ni Solid Solutions

51%
Permogorov S., Tenishev L., Sokolov V., Surkova T.
Acta Physica Polonica A
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1992
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vol. 82
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issue 4
705-708
EN
Absorption and reflectivity measurements were carried out on Zn_{1-x}Mn_{x}Se:Ni solid solutions. The spectra demonstrate the radical change of the structure of internal Ni^{2+}(3d^{8}) transitions at the presence of the Mn ions and strong dependence on Mn concentration. The threshold energy ħω_{th} for the process of Ni photoionization to the valence band Ni^{2+}(3d^{8}) + ħω_{th} → Ni^{1+}(3d^{9}) + h is shifted to the lower energy by 30 meV, but hardly depends on x despite the essential increase in the energy gap.
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