IMPACT-PARAMETER DEPENDENCE OF THE ELECTRONIC-ENERGY LOSS AND ANGLE-DEPENDENT ENERGY-LOSS FOR IONS TRAVERSING THIN FOILS

The impact-parameter dependence of the electronic energy loss has been investigated using the quantal harmonic oscillator model and the shel l-wise model of atomic stopping for ions with velocity v > v0 and v < v0, respectively. The electronic energy losses obtained by the impact- parameter dependent formalism have been used in a Monte Carlo simulati on code to give the angular dependence of the energy loss of protons, helium ions and heavy ions transmitted through thin foils. The model c alculations are compared with available experimental data.