Abstract
At 80 K, exposure of the Cu(100) surface to oxygen results in a disordered (2 × 2) structure, followed by a (√2 ×√2) R45° mesh at higher coverage. The FWHM value of the O(1s) peak at 80 K is large (∼4.5 eV) indicating a range of metal-oxygen bond strengths. On warming to 290 K about half of the oxygen adsorbed at 80 K is desorbed below 150 K and there is a narrowing of the O(1s) peak to 2.3 eV. The (√2 ×√2) R45° mesh is, however, retained but with apparently improved ordering of the surface structure. A model for the adlayer is suggested.
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