Low-Energy-Electron-Diffraction Rotation Diagrams for the (100) Face of Aluminum

Abstract

Low-energy-electron-diffraction rotation diagrams are calculated for A1 (100), and the results are compared with experimental measurements. The agreement between theory and experiment is qualitatively correct for an energy $E=50\mathrm{}$ eV and an angle of incidence $\theta =32\mathrm{}°$ but is much less satisfactory for $E=20\mathrm{}$ eV and $\theta =50\mathrm{}°$. The effect of small changes in the upper-layer spacing on the calculated rotation diagrams is also investigated. It is found that the primary effect is to change the magnitude of the rotation diagram and not its qualitative shape. This apparent insensitivity to geometrical effects may be an asset in using the rotation diagrams to study resonance effects.