Monte-carlo calculations of the back-scattering of high-energy heavy ions from metal surfaces

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Abstract
Random numbers are used to describe the plural scattering of fast heavy ions by amorphous metal films. Rather simple expressions for the single interactions are derived employing a screened Coulomb potential and with regard to the important energy losses of the particles in the foils. As a first result the computer program yields qualitatively the shape of the particle trajectories in accordance with observed fission fragment tracks in thin metal films. Furthermore the spatial distribution of the reflected particles together with the total reflection rate is studied as a function of the entrance angle. It is seen that the portion of the reflected particles decreases rapidly with increasing angle. Similarly the penetration depths and the energy spectra are strongly influenced by the angle of the incident beam. The results are in satisfactory agreement with known experiments.