Abstract
CaF2 in the surface layer with a thickness of a few nanometers was converted to CaO by electron bombardment heating above 300°C, but CaO was not formed by the lamp heating. This conversion is thought to occur by electron bombardment to the sample surface during heating. Furthermore, it was found by chemical-state-discriminated X-ray photoelectron diffraction (XPED) measurements that CaO grew epitaxially on CaF2(111). The crystallographic orientation of the CaO epitaxial layer was directly determined from the analysis of XPED patterns.
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