Abstract
The surfaces of spherical copper crystals were investigated by HEED (60 keV electrons). Grown by solidification of a drop of melt in high vacuum the untouched crystals only show diffraction patterns from the clean copper. After adsorption of oxygen from 10-4 to 5·10-3 torrmin. air at 800 °C extra spots appear in the diffraction patterns. They are characteristic of diffraction from twodimensional surface structures. Special structures due the adsorption of oxygen are reported for the (001), (011), (014), (223) and (035) surfaces not only for these poles but also for their surroundings. On the high indexed surfaces (014), (035) and (223) (1 × 1)-adsorption structures were observed. No adsorption structures were obtained on (111) and (112). A vacuum anneal of 400 °C destroys the adsorption structures by solution of the oxygen atoms into the bulk of the copper crystals. The adsorption structures and the boundaries of their domains do not show a relationship to the known epitaxy of threedimensional Cu2O on Cu.
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