Normal photoelectron diffraction of O/Cu(001): A surface-structural determination

Abstract

The two systems $c(2\mathrm{}\times 2)\mathrm{O}/\mathrm{Cu}\mathrm{}\left(001\right)\mathrm{}$ and $(\sqrt{2}\times 2\sqrt{2})R45°$ O/Cu(001) have been studied by normal photoelectron diffraction (NPD), with the use of $\mathrm{O}\mathrm{}\left(1s\right)\mathrm{}$ line. In the $c(2\mathrm{}\times 2)$ structure oxygen occupies the fourfold hollow site, with $d_{\perp }=0.80\mathrm{}\left(5\right)\mathrm{}$ Å. The $\sqrt{2}\times 2\sqrt{2}$ structure has a similar NPD curve, indicating the same local site geometry for the $c(2\mathrm{}\times 2)$ sublattice.