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The adsorption of calcium (Ca) atoms on a Cu(001) surface has been studied by low-energy electron diffraction (LEED) at 130, 300 and 400K. It is found that a (4×4) was the only LEED pattern appeared at 400K while a quasi-hexagonal structure was formed in a wide range of submonolayer coverage at 130K. At 300K, the (4×4) LEED spots were broad and weak. The (4×4) structure formed at 400K was determined...
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