Abstract
Excitation functions for helium levels excited with a carbon foil are compared with those excited by a single collision ion-atom interaction. A model for the beam foil interaction process is proposed which applies theoretical and experimental results from ion- atom collisions to beam-foil collision data. It is shown that in many respects, the ion-atom and beam-foil interactions are similar. The significant difference is the complication introduced by the high density foil material which effectively causes effects such as excitation functions, sputtering and spectra to appear as gross features averaged over many unrelated collisions.
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