OXYGEN ON FE(100) AND FE(110)

Investigations of the electronic and magnetic properties of oxygen ads orbed on magnetized iron films have been carried out by means of angle and spin resolving photoelectron spectroscopy. Iron, epitaxially grow n on W(100) and W(110) crystals, served as the ferromagnetic substrate . Exchange splittings of the O 2p(x) derived level have been detected, demonstrating a magnetic coupling between the chemisorbate and the ir on layer. Variations of the exchange splitting have occurred as a func tion of the oxygen coverage, photon energy, and emission angle. High o xygen exposures have lead to a FeO overlayer at the surface.