Abstract
A study of the core-hole decay spectra of O/Ni(100) c(2\ifmmode\times\else\texttimes\fi{}2) is presented. Spectra were recorded at photon energies corresponding to the O 1s x-ray-absorption (XA) resonance, as well as high above the O 1s threshold. Additional spectra were recorded at photon energies corresponding to characteristic features in the XA spectrum just above the O 1s threshold. These spectra were found to provide important information regarding the electronic structure of atomic oxygen on nickel. Broadenings in the decay spectra due to population of Rydberg states are observed. A shoulder on the high-kinetic-energy side of the spectra is interpreted as a result of Auger final states made up by independent valence holes. It was found that the spectroscopic behavior of the O/Ni(100) system is in many respects similar to that of pure Ni.
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