ELECTRONIC-ENERGY LOSS OF HELIUM-IONS IN ALUMINUM

Electronic stopping powers for fixed-charge-state He ions, He2+ and He +, in Al target are calculated within the framework of linear-response dielectric theory by using the dynamic local-field correction in the dielectric function and the concept of local plasma density approximat ion. An average stopping power has been defined by weighting the fixed -charge-state results with theoretical occupation probabilities. Satis factory agreement between this average stopping power and experimental data, measured for He-ion beam, is found.