Sensitivity of the electronic stopping power to the shell structure of the target material

Calculations of the electronic stopping power, Ssub(e), based upon previously developed modifications of the Firsov theory, are presented for nitrogen ions on target materials from helium to molybdenum. From recent experimental results for the range distributions of 800 keV nitrogen ions implanted in a series of elemental target materials, values of Ssub(e) for nitrogen ions in these materials has been inferred. These values, which suggest the occurrence of a periodic structure in Ssub(e) for this system similar to that observed for other systems, are used to establish a parameterization of the modified Firsov model. With the same parameterization this model is applied to other systems for which stopping power data are available to test it as a universal model. (Auth.)