Adsorption of 0.25ML oxygen on the Cu{100}-c(2 x 2)–Pt surface alloy followed by a brief thermal activation to 500K and re-cooling to room temperature led to the formation of a surface structure with a p(2 x 2) periodicity. The structure of this Pt/Cu{100}-(2 x 2)–O was determined by quantitative low energy electron diffraction calculations using the symmetrised automated tensor low-energy electron diffraction program. The results of the calculations suggest that simple p(2 x 2) overlayers could be ruled out in favour of an oxygen-induced surface reconstruction. The favoured model (Pendry R-factor = 0.23) consisted of a mixed c(2 x 2) CuPt underlayer below a reconstructed Cu{100} outermost layer with oxygen atoms occupying a slightly displaced fourfold hollow sites above second layer Pt atoms relative to the original unreconstructed surface.

The Structure of Oxygen-Induced Reconstruction on Cu{100}-c(2 x 2)–Pt Surface Alloy - the Pt/Cu{100}-(2 x 2)–O. E.AlShamaileh, K.Pussi, H.Younis, C.Barnes, M.Lindroos: Surface Science, 2004, 548[1-3], 231-8