Proper surface channelling of low energy argon ions incident on a nickel (110) crystal

I. N. Evdokimov, J. A. Van Den Berg, D. G. Armour

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Abstract

The scattering behaviour of 6 keV argon ions from a nickel (110) surface has been investigated for specular reflection under grazing incidence conditions. The occurrence of an anomalously high energy loss has been confirmed and the transition from chain scattering at large scattering angles to a distinctly different type of scattering at small angles has been investigated. The characteristics of the low angle scattering phenomena, which dominate the observed spectra at scattering angles below about 18 degree , may be explained in terms of a surface hyperchannelling model in which the incident ions are confined to move within the shallow ″potential valleys″ between two atomic rows in the surface. The critical angle for occurrence of this phenomena which is distinctly different from surface semichannelling has been evaluated with Lindhard's standard string potential. The experimentally measured critical angles are in good agreement with the calculated ones.

Original languageEnglish
Pages (from-to)33-41
Number of pages9
JournalRadiation Effects
Volume41
Issue number1
DOIs
Publication statusPublished - 1979
Externally publishedYes

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