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Stopping cross sections of TiO2 films were measured for H and He ions in the energy intervals 200−1500 keV and 250−3000 keV, respectively, using the Rutherford backscattering technique. Theoretical calculations were performed by means of two versions of the dielectric formalism and a non-linear model. Good agreement is found between the present experimental data and the theoretical results at intermediate and high energies, and also with the very limited experimental information available in the literature.

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The 4s4p configuration of Zn is analyzed using the Relativistic jj-coupling approach. The experimentally determined relativistic Slater integrals are compared with the results of numerical codes, both quasi-and fully-relativistic ones. In this work, they are estimated, semi-empirically, the two J = 1 levels up Z = 70 and the 1 P1 level up Z = 92 by judicious interpolation and extrapolation of energies. The comparison with extensive relativistic configuration-interaction calculations indicates that differences between both approaches are of the order of measurement accuracies.

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In this work, we re-examine the Thomas–Fermi formalism as an approach to the calculation of atomic binding energies. We focus on the concept of electron density as the central magnitude, and the way in which the different contributions to the total energy can be evaluated from it. Total energies of simple atoms (Z = 2 to 10) are calculated using three different analytical approximations for the electronic density, and the results are compared with those obtained within the Hartree–Fock model.