DOMINANCE OF SHORT-RANGE-ORDER EFFECTS IN LOW-ENERGY ELECTRON-DIFFRACTION INTENSITY SPECTRA

P HU*, CJ BARNES, DA KING

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Using low-energy electron-diffraction (LEED) formalism, we demonstrate theoretically that LEED I-V spectra are characterized mainly by short-range order. We also show experimentally that diffuse LEED (DLEED) I-V spectra can be accurately measured from a disordered system using a video-LEED system even at very low coverage. These spectra demonstrate that experimental DLEED I-V spectra from disordered systems may be used to determine local structures. As an example, it is shown that experimental DLEED I-V spectra from K/Co {1010BAR} at potassium coverages of 0.07, 0.1, and 0.13 monolayer closely resemble calculated and experimental LEED I-V spectra for a well-ordered Co{1010BAR}-c(2X2)-K superstructure, leading to the conclusion that at low coverages, potassium atoms are located in the fourfold-hollow sites and that there is no large bond-length change with coverage.

Original languageEnglish
Pages (from-to)13595-13598
Number of pages4
JournalPhysical Review B (Condensed Matter)
Volume45
Issue number23
Publication statusPublished - 15 Jun 1992

Keywords

  • X-RAY PHOTOELECTRON
  • DIFFUSE LEED
  • SURFACE CRYSTALLOGRAPHY
  • MULTIPLE-SCATTERING
  • AUGER-ELECTRON
  • TENSOR LEED
  • TOOL

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