The parabolas and circles in RHEED patterns

Nan Yao, J. M. Cowley

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The continuous circles and parabolas which occur in Kikuchi line arrays in RHEED patterns have been interpreted as arising from surface resonance channelling effects. Similar circles and parabolas have also been observed in transmission patterns and may be attributed to channeling along rows of planes of atoms in the bulk crystal. We have made further observations on InP (110), GaAs (110) and Pt (111) surfaces and comparisons of the circles and parabolas, obtained in reflection and transmission as a function of incident beam direction. Differences observed in intensity and position of these features may represent the difference between bulk and surface channelling phenomena. Observations have also been made on the temperature dependence of the Kikuchi line features.

Original languageEnglish (US)
Pages (from-to)149-157
Number of pages9
Issue number1
StatePublished - Sep 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation


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