[en] The comparison of polarized electron production methods available is carried out. The polarized electron production during ionization of atoms with a single outermost electron by circular polarization light is considered in detail. Polarized electrons is produced in the following cases: 1) near the Cooper minimum in the p→d transitions; 2) in the range of autoionizing states with total moment J=1/2 for which the only decay channel is the np→epsilonS transition; 3) during two-photon ionization when the first photon excites the descrete n'Ssub(1/2)-state. The second method possesses the maximal electron quantum yield, but the necessity of usage the power monochromatic source is the disadvantage. In the third case the laser application is possible. The parameters of the tallium electron source employing the effects described are given

[en] Auger capture of muons by He atoms is calculated in the nonrelativistic Hartree-Fock approximation. The calculation is carried out for the muon capture into states having the principle quantum number n>=4, the radiational capture being small for these states to be neglected. The atom polarization by a projectile and the correlations in the initial states which contributions for helium atom being small, are also neglected. The initial meson energy amounts from 1 to 175 eV. The following values are calculated: the meson capture cross sections G into the definite n states as a function of the orbital moment l, G as a function of l summed over n, G as a function of n summed over l, the total capture cross section depending on the meson energy E. The G approximately (2l+1) low is found to be valid only for small l and l>10. The most probable capture occurs into the states with n=14-20. With an increase in n, G quickly decreases as n^-3. When E exceeds the atom excitation threshold G quickly drops. At E higher than the ionization potential I, the elastic and inelastic cross sections (>10¹⁵ cm^-2) exceeds the capture cross section by an order of the magnitude. Meson capture is best probable at E< or approximately I

[en] Results of calculation of the electron polarization degree in the random phase approximation with exchange are presented for Ar and Xe atoms. The 3s² and 2p⁶ electron effect on the 3p⁶ subshell has been considered for Ar. Spin-orbital interaction has not been taken into account in the matrix element calculation. Calculation values of angular distribution asymmetry coefficient β are in a good agreement with the experiment. The absorption of nonpolarized and linearly polarized light has been thoroughly examined. In both cases polarization is determined by xisup(tau) coefficient. This coefficient changes its sign twice. At electron energy of epsilon = or approximately 1.3 Ry the xi sign change arises from the change in the sinus sign of the phase difference, and at epsilon = 2.45 Ry minimum cooper cross section takes place, in which matrix element dsub(l+1) changes sign. The dependence of the photoelectron polarization degree on the quantum energy for nonpolarized and linearly polarized light is given. The electron polarization degree measurement on the nonpolarized light absorption has confirmed the existence of strong intershell interaction in Xe atoms

[en] It is shown that the deviation of the angular distribution asymmetry parameter β for the outer ns² subshells from the value 2, expected in the LS coupling scheme, is a combined effect of many-electron correlations and spin-orbit interaction. (Auth.)

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[en] Calculations of different physical quantities in single-particle approximation, especially the photoionization cross section and the inelastic scattering of fast electrons on atoms, demonstrate the significant role of correlations in atoms. To take correlations into account the random phase approximation with exchange (RPAE) is proposed. The physical meaning of this approximation is discussed and expressions for various atomic characteristics in this approximation are derived. It is demonstrated that the role of correlations significantly depends on the choice of single-particle approximation. Calculational results for different processes and atomic characteristics in RPAE for a number of atoms from He to Ba are presented. (Auth.)

[en] The calculation of negative muon capture by atoms in the Hartree-Fock approximation is presented. The meson capture into states with main quantum number n (>=) 4 is studied, in so doing only the Auger capture is considered. Available programs obtained elsewhere were used to calculate the wave functions of atoms in the ground state those of an electron in continuum and of a meson in continuum and line spectra. To calculate the meson capture cross sections a special program was written. Data are presented for He atoms at initial meson energy ranging from 1 to 175 eV. The following values are calculated: the cross sections as a function of the orbatal moment of the meson final state at the fixed main quantum number n; the capture cross sections into states with different n summed up over the orbital moments; the total cross section depending on the meson energy. It is concluded that mesons are mainly captured by He atoms at energies below the excitation potential, i.e. at E < 21 eV. Analogous calculations for Ne atoms are made

[en] To find the energy range at which μ-meson capture by He atom takes place with maximum probability cross sections of the Auger capture, elastic and inelastic μ^--meson scattering by He atoms have been found for the meson energies of 1 to 175 eV. The atom and knockedout electron are described by the Hartree-Fock wave functions. For the meson in the initial and final states Hartree wave functions in the field of the ''frozen'' atom and ion, respectively, are used. The distributions of probabilities of meson capture into states with different principal and orbital quantum nUmbers n, l are calculated. It is shown that the mesons are predominantly captured at energies equaling to the ionization potential of the atom

No abstract available