Abstract
Surface structure of thin CaO layers formed on the CaF 2(111) surface was investigated by two types of photoelectron diffraction methods. High angular resolved X-ray photoelectron diffraction (XPED) patterns indicate that two CaO domains. CaO(111) and CaO(-1-1-1), epitaxially grew and the lattice expansion occurred parallel to the surface because of the large mismatch. The change of dominant domain orientation was observed as increasing the thickness of films. We found that 8% lateral expansion and no vertical contraction occurred in 8A˚CaO layers, compared with Ca2p scanned energy photoelectron diffraction patterns and those calculated for model structures.
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