(2×1) Oxygen superstructure on Cu(210) surface studied by quantitative LEED analysis and STM

Abstract

Adsorption of oxygen at elevated temperatures on Cu(210) surface leads to the formation of a (2 × 1) superstructure similar to that found on Cu(110). Previous STM work done on this system showed diperiodic Cu-O rows running along the [001] direction. In this work, low energy electron diffraction (LEED) experiments were done on the Cu(210)-(2×1)O surface structure. Ten diffracted beams at normal incidence were used for multiple scattering calculations using the Barberi/Van Hove symmetrized tensor LEED code. Four models were optimized for the calculations and the best fit to experiment is found to be the model with alternate missing -Cu-0- rows and oxygen atom occupying the long bridge site. Oxygen to first and second Cu nearest neighbors are optimized to 1.81 and 1.92 Å respectively and the position of the oxygen atom above the (110) plane have been optimized to about 0.12 Å.