(2x1) oxygen superstructure on Cu(210) surface studied by quantitative LEED analysis and STM

Adsorption of oxygen at elevated temperatures on Cu(210) surface leads to t he formation of a (2 x 1) superstructure similar to that found on Cu(110). Previous STM work done on this system showed diperiodic Cu-O rows running a long the [001] direction. In this work, low energy electron diffraction (LE ED) experiments were done on the Cu(210)-(2 x 1)O surface structure. Ten di ffracted beams at normal incidence were used for multiple scattering calcul ations using the Barberi/Van Hove symmetrized tensor LEED code. Four models were optimized for the calculations and the best fit to experiment is foun d to be the model with alternate missing -Cu-O- rows and oxygen atom occupy ing the long bridge site. Oxygen to first and second Cu nearest neighbors a re optimized to 1.81 and 1.92 Angstrom respectively and the position of the oxygen atom above the (110) plane have been optimized to about 0.12 Angstr om.