Abstract
We report results from a first-principles total-energy study of primitive (1×1) O chemisorbed on magnetic Fe(001). The adsorption-induced relaxation is found to be a factor of three larger than was inferred earlier from an analysis of LEED intensity data, reflecting strong covalent OFe bonding. The resulting arrangement of surface Fe and O atoms already closely resembles a rock-salt FeO monolayer which is comparatively weakly bound to the substrate. The surface bands are compared with angle-resolved photoemission data of Panzner, Mueller and Rhodin.