학술논문
The structure of the alpha-Al2O3(0001) surface from low-energyelectron diffraction: Al termination and evidence for large thermalvibrations
Document Type
Journal Article
Author
Source
Physical Review B; 65; 19; Other Information: Journal Publication Date: 05/15/2002
Subject
Language
English
Abstract
We have determined the surface structure of alpha-Al2O3(0001) using dynamical low-energy electron diffraction (LEED). Sapphire surfaces were prepared in three different ways, and the diffraction results were analyzed using an exhaustive search of possible models. For all sample processing conditions, the clearly favored structure has a single Al layer termination and a large first interlayer contraction. In addition, we find that the surface atoms have unusually large vibrational amplitudes at room temperature, suggestive of an anharmonic vibrational mode.