Electronic structure investigation of Ag(110)/1 × 2-O surface

Abstract

Ag(110)/1 × 2-O surface induced by chemisorption of atomic oxygen was newly found and investigated by low energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS) and angle-resolved ultraviolet photoelectron spectroscopy (ARUPS). As results, it was suggested that the substrate was reconstructed with1 × 2 periodicity by LEED analysis. The oxygen coverage of theAg(110)/1 × 2-O surface was 0.5 ML by XPS measurements. We then propose that theAg(110)/1 × 2-O surface is reconstructed to a1 × 2 missing row structure where every second [¯110] Ag row is missing. ARUPS measurements along [001] and [¯110] directions on theAg(110)/1 × 2-O and2 × 1-O surfaces were performed. The interaction energies between Ag and O atoms were determined by comparing an LCAO calculation with the experimental results of the2 × 1-O surface. Several candidates for the1 × 2-O structure model were given by calculations using the interaction energies.