Energy loss and mean excitation energy of ions in solids within the shellwise local plasma approximation

C. C. MONTANARI; D. M. MITNIK; C. ARCHUBI; J. E. MIRAGLIA

Gramado

Congreso; Third International Meeting on Recent Developments in the Study of Radiation Effects in Matter; 2010

International Committee fo the International Meetings on Recent Developments in the Study of Radiation Effects in Matter

We present  a theoretical study on the energy loss of ions in solids, its mean value or stopping power, the quadratic dispersion or energy loss straggling. The formalism employed is the shellwise local plasma approximation (SLPA). This formalism, proposed originally by Lindhard [1] many years ago, has evolved in the last years by considering the independent shells of electrons and the ionization threshold of each shell explicitly [2].   The SLPA has the advantage of dealing with very heavy targets, like Au with 79 electrons, with the same degree of complexity of much simpler ones, like C or Al. On the other hand, the same formalism is employed to describe bound electrons of solids or gas targets, and to calculate different moments of the energy loss. The only inputs are the density of each shell of electrons and its binding energies. No parameters are included. We will review in this talk the SLPA results and limits for ions in solids like Al, Zn or Cu [3-4], but also very heavy targets such as Au, Pb, Bi or W [2,5], showing the comparison of the ab-initio theoretical calculation with the experimental data and the SRIM results. We will also present in this opportunity theoretical values for the mean excitation energy and the comparison with Bethe high energy limit for the stopping power. As the energy loss of ions in solids is related to the inner-shell ionization, we also compare SLPA results for inner-shell ionization cross sections of solids with experimental data [6].   [1] J. Lindhard and M. Scharff, Mat. Fys. Medd. Dan. Vid. Selsk. 27, 1 (1953). [2] C. C. Montanari, C. D. Archubi, D. M. Mitnik and J. E. Miraglia, Phys. Rev. A 79, 032903 (2009). [3] E. D. Cantero R. C. Fadanelli, C.C. Montanari, M. Behar, J.C. Eckardt, G.H. Lantschner, J.E. Miraglia, and N.R. Arista, Phys. Rev. A  79, 042904 (2009). [4] C. C. Montanari, J. E. Miraglia, arXiv:0904.1386v1 (2009). [5] C. C. Montanari, D. M. Mitnik, C. D. Archubi and J. E. Miraglia, Phys. Rev. A 80, 012901 (2009). [6]  M. Czarnota et al, Phys. Rev. A 79, 032710 (2009).