Bremsstrahlung spectra for a 0.2-10 keV electron on Ba are calculated for the photon frequencies above the 4d-threshold: omega =100-200 eV. The polarization bremsstrahlung is taken into account. A simple method is proposed for the approximate calculation of the polarizational bremsstrahlung cross section.

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In this work the influence of many-electron effects on the shape of characteristic X-ray emission bands of the simple metals Mg and Al are examined by means of ab initio calculations and semiempirical models. These approaches are also used for the analysis of C K-emission and absorption spectra of graphene. Both, the dynamical screening of the core vacancy and the Auger-effect in the valence band (VB) have been taken into account. Dynamical screening of the core vacancy by valence electrons (the so-called MND effect) is considered ab initio in the framework of density functional theory. The Auger effect in VB was taken into account within a semi-empirical method, approximating the quadratic dependence of the VB hole level width on the difference between the level energy and the Fermi energy. All theoretical spectra are in very good agreement with available experimental data.