Low-energy ion-scattering study of the oxygen-induced reconstructedp(2×1) andc(6×2) surfaces of Cu(110)

Abstract

The oxygen-induced Cu(110)-p(2×1)O and Cu(110)-c(6×2)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(2×1) structure is confirmed in this work. The oxygen atoms were found to be located in the [100] bridge position, 0.05±0.06 Å below the Cu atoms. The recently proposed structure for the c(6×2) 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±0.12 Å and 0.40±0.12 Å above the underlying Cu layer, respectively. The remaining O atoms are located in the [100] bridge positions 0.12±0.12 Å below the Cu atoms.