Abstract

By assuming that incident ions are scattered in a single wide-angle collision and that the energy loss in the solid is due only to interaction with electrons, an expression for the number of ions back-scattered from a surface is derived. Measurements have been made of the energy distribution of protons and deuterons back-scattered from titanium and niobium. Good agreement is obtained between the measured and calculated energy distributions both in general shape and in the absolute values of the number of particles back-scattered from titanium. In the case of niobium there is evidence that multiple scattering is taking place.

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