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The growth of Ni films deposited on a reconstructed (√2x2√2)R45 o O/Cu(001) is examined. It is shown that deposition of Ni changes the surface symmetry to c(2x2) and that oxygen always floats on the film surface. No NiO is formed. Surface roughness decreases and the growth mode is closer to ideal layer-by-layer, as compared to that of Ni/Cu(001) indicating a surfactant activity of oxygen....
The order-disorder transition of the p(2 2) phase of oxygen chemisorbed on Ni(111) has been studied using low-energy electron diffraction (LEED). The transition was found to be continuous, and the measured critical exponents are consistent with those predicted for the 4-state Potts model. These results agree with the theoretical predictions for this overlayer based on symmetry considerations, but...
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