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 language | English |
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Pages (from-to) | 13595-13598 |
Number of pages | 4 |
Journal | Physical Review B (Condensed Matter) |
Volume | 45 |
Issue number | 23 |
Publication status | Published - 15 Jun 1992 |
Keywords
- X-RAY PHOTOELECTRON
- DIFFUSE LEED
- SURFACE CRYSTALLOGRAPHY
- MULTIPLE-SCATTERING
- AUGER-ELECTRON
- TENSOR LEED
- TOOL