Abstract
We have carried out a back-reflection x-ray standing-wave (BRXSW) investigation to study the adsorbate ordering in the system (1x2)Rb/Cu(110), which corresponds to an alkali-induced missing row reconstruction of the Cu(110) surface. By carrying out measurements in three different scattering geometries, we find that for the missing row structure at room temperature, the Rb adatoms are extremely well ordered in the direction perpendicular to the surface, show a high degree of ordering across the missing rows (e.g., the atoms are locked into the missing row troughs), but are highly disordered along the rows, similar to a one-dimensional lattice gas. We compare our results to the Rb/Cu(110)-saturated surface at room temperature and to our previous BRXSW investigation of Rb/Cu(111). (c) 2000 The American Physical Society.
Highlights
The alkali-induced (1ϫ2) reconstructions of the110͒ surfaces of fcc metal crystals have been extensively investigated as prototypic examples of adsorbate-induced surface reconstructions.[1,2,3] It has been demonstrated by a variety of surface structural probes that for the (1ϫ2) overlayer the alkali adatoms induce a missingor addedrow reconstruction of the substrate surface, with every other close-packed row removed due to the adsorption of the alkali adatomssee Fig. 1͒
By carrying out measurements in three different scattering geometries, we find that for the missing row structure at room temperature, the Rb adatoms are extremely well ordered in the direction perpendicular to the surface, show a high degree of ordering across the missing rowse.g., the atoms are locked into the missing row troughs, but are highly disordered along the rows, similar to a one-dimensional lattice gas
We find that for the missing row structure at room temperature, the Rb adatoms are extremely well ordered in the direction perpendicular to the surface, show a high degree of ordering across the missing rows, but are highly disordered along the rows
Summary
D. Heskett Department of Physics, University of Rhode Island, Kingston, Rhode Island 02881. We have carried out a back-reflection x-ray standing-waveBRXSWinvestigation to study the adsorbate ordering in the system (1ϫ2)Rb/Cu110͒, which corresponds to an alkali-induced missing row reconstruction of the Cu110͒ surface. By carrying out measurements in three different scattering geometries, we find that for the missing row structure at room temperature, the Rb adatoms are extremely well ordered in the direction perpendicular to the surface, show a high degree of ordering across the missing rowse.g., the atoms are locked into the missing row troughs, but are highly disordered along the rows, similar to a one-dimensional lattice gas. We compare our results to the Rb/Cu110͒-saturated surface at room temperature and to our previous BRXSW investigation of Rb/Cu111͒
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