A phenomenological complex optical potential is used to investigate the elastic and inelastic scattering of electrons by Ca, Sr, Ba and Yb atoms in the energy range E

A model based on the local spin density approximation has been suggested to describe elastic potential electron scattering by atoms with half-filled subshells. This model is applied to the case of electron scattering by such atoms having one s1-, p3-, d5- or f7-subshell (i.e. Ag, Sb, Mn and Eu). The angular dependences of asymmetry functions and differential cross sections (DCSs) both with and without taking into account absorption effects, integral elastic, absorption, diffusion and viscosity cross sections have been calculated at the 10 eV collision energy. Similar characteristics have been calculated for the Mn atom at the 20 eV energy. DCSs are calculated both in the local (spin-unpolarized) and local spin density (spin-polarized) approximations and compared with each other. Some cross sections for Ag, Mn, Eu atoms are compared with available experimental and theoretical data.

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The minima in the differential cross sections (DCSs) and the spin polarization in the elastic electron scattering by the mercury atoms have been studied within the collision energy range from 0.1 up to 2000 eV. The differential and integral cross sections and the Sherman function S(θ ) have been calculated in the relativistic complex optical potential approximation. The results of the above calculation agree well with the experimental and the theoretical data. The energy and the angular positions of 13 critical minima in the DCSs have been found. The highest energy minimum is located at [1656.6 eV; 137.14 • ]. A minimum at 150 eV in the energy dependence of the scattering DCSs at 180 • was found. This minimum is related to the presence of a high-angle critical minimum at [157.8 eV; 161.33 • ]. The appearance of this minimum is due to the exchange interaction being taken into account. The 23 points of the scattered electron total polarization (S = ±1) near the critical minima, the energy and the angular widths of the polarization vicinities, where |S| 0.9, have been determined.