Abstract

In this work, we determine theoretical stopping coefficients for H, He and Li slow ions. Using a density functional theory framework, we found as a function of the electronic density of different solid targets the scattering phase shifts and the corresponding stopping coefficients of slow light ions. The phase shifts as a function of the electron speed are determined and using this values at the Fermi velocity, we calculate the transport cross section and the stopping coefficients Q. As a whole, our results are in relative good agreement with the experimental data. To obtain more satisfactory results, it was necessary to modify our calculations to take into account the local electron density of the target. In the case of the hydrogen ion, the values obtained, with both approximations together, are in agreement with a large number of the available experimental results. We found that the calculations performed for the helium ion show a noticeable discontinuity and also that when we take into account the total local electronic density of the target to account for the experimental data. In the case of lithium ion, the calculation is in good agreement with the experimental data for the case of Si, Zn and Ag when we take into account the total local electronic density of the target and also we find that for Li ion further experimental measurements are necessary in this energy range.