Abstract
The atomic structure of the Al(311) surface has been determined using Low Energy Electron Diffraction (LEED). The surface unit cell was found to be in lateral registry with the bulk lattice. However, there are large vertical relaxations of the first and second atomic planes perpendicular to the surface. The first interplanar spacing, d 12, is contracted by 13% relative to the bulk value and d 23 is expanded by 9%. Even though no lateral displacements were found to exist at the surface, the comparison of calculated and experimental LEED spectra was found to be sensitive to lateral displacements, which is contrary to commonly held beliefs concerning LEED analysis.
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