Theoretical-experimental study of energy loss of Li ions in Zn

C. C. MONTANARI; J. E. MIRAGLIA; M. BEHAR; P. F. DUARTE; N. R. ARISTA; J.C. ECKARDT; G.H. LANTSCHNER

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

American Physical Society

Año: 2008 vol. 77 p. 429011 - 429016

1050-2947

We have performed a combined theoretical-experimental study of the energy loss of Li ions in Zn, on a wide range of energies, together with comparative studies for H and He ions on the same target. By using Zn films and the Rutherford backscattering technique (RBS), we were able to determine the stopping power for Li ions in the (0.3 to 5) MeV energy interval. The experimental results cover an energy range which includes the maximum of the stopping power. The values obtained agree well with previous measurements done in a limited energy interval and with the semi-empirical code SRIM 2003. On the other hand, we have performed extit{ab initio} theoretical calculations based on the Extended Friedel Sum Rule-Transport Cross Section formulation for the valence electrons and the Shellwise Local Plasma Approximation for the inner-shells. This theoretical description reproduces reasonably well the experimental results on the whole studied energy range. The same occurs with previous measurements performed with H and He on the same target. The importance of the screened potential on the stopping power due to the valence electrons is stressed in the present description.