The low-angle scattering of energetic ions from an amorphous surface

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Abstract
Ions of hydrogen and helium incident at 275 keV have been scattered from a flat surface composed of amorphous tungsten oxide prepared by anodisation. Measurements of the angular distribution and the energy spectrum have been conducted for various angles of incidence and angles of scattering up to 5°. The observations are compared with the predictions of a plural scattering theory and good agreement is found. In particular, the most probable energy loss of the scattered ions is proportional to the scattering angle, the angular distribution of ions scattered with any particular energy loss is roughly a gaussian function truncated by the surface plane whilst the energy spectrum has nearly the predicted form of a skewed peak.

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