Univ Santiago Chile Dept Phys Pob 307 Santiago 2 Chile
Max Planck Inst Festkorperforsch D-70569 Stuttgart Germany
Univ Tecn Feder Santa Maria Dept Phys Valparaiso Chile
Ctr Atom Bariloche Ra-8400 San Carlos Barilo Rio Negro Argentina

Experimental results on proton energy loss distributions obtained by ion transmission measurements in Pd polycrystalline thin films are reported. Deviations from the proportionality behavior of the energy loss as a function of the ion velocity is observed. These results are compared with similar measurements in Au. A theoretical model previously developed is used to explain the observed velocity dependence. General trends on the relationship between the electronic density of states of these metals and the non-proportionality of the energy loss with ion velocity are discussed.
 

Nuclear Instruments & Methods in Physics Research B, 164-165 268-271, 2000.