Bonding of Oxygen on Al(111): A Surface Extended X-Ray Absorption Fine-Structure Study

Abstract
The initial ordered chemisorption stage of oxygen on Al(111) has been investigated using polarization-dependent surface extended x-ray absorption fine-structure measurements above the O $K$ absorption edge. The O-Al bond length in the threefold hollow adsorption site has been determined to be 1.79\pm\else\textpm\fi{}0.05 \AA{}. A strong polarization dependence of the extended x-ray absorption fine-structure signal allows the determination of the O-O distance (2.90\pm\else\textpm\fi{}0.05 \AA{}) between the chemisorbed oxygen atoms.