Low-energy ion-scattering study of the oxygen-induced reconstructed<i>p</i>(2×1) and<i>c</i>(6×2) surfaces of Cu(110)

Abstract

The oxygen-induced Cu(110)-p(2\ifmmode\times\else\texttimes\fi{}1)O and Cu(110)-c(6\ifmmode\times\else\texttimes\fi{}2)O surfaces were studied by means of low-energy ion scattering combined with time of flight. The surfaces were bombarded with 6-keV Ar ions and azimuthal scans for recoiled O and Cu were compared with Monte Carlo computer simulations. The ``added row'' model for the p(2\ifmmode\times\else\texttimes\fi{}1) structure is confirmed in this work. The oxygen atoms were found to be located in the [100] bridge position, 0.05\ifmmode\pm\else\textpm\fi{}0.06 \AA{} below the Cu atoms. The recently proposed structure for the c(6\ifmmode\times\else\texttimes\fi{}2) surface was confirmed by our data and information about the z positions of the O and Cu atoms was obtained. The topmost ``superstructure'' Cu and O atoms are located 0.45\ifmmode\pm\else\textpm\fi{}0.12 \AA{} and 0.40\ifmmode\pm\else\textpm\fi{}0.12 \AA{} above the underlying Cu layer, respectively. The remaining O atoms are located in the [100] bridge positions 0.12\ifmmode\pm\else\textpm\fi{}0.12 \AA{} below the Cu atoms.