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Reflection anisotropy spectroscopy of clean and adsorbate-covered Ni(110) surfaces

The reflection anisotropy (RA) spectra from clean Ni(110), Na/Ni(110)(1×2), and CO/Ni(110) surfaces have been measured between 1.5 eV and 4.0 eV. Electronic transitions involving exchange-split d bands to an unoccupied surface state contribute a broad structure to the RA profile of Ni(110). The Na-induced surface reconstruction gives rise to a change in the RA profile that is related to changes in the unoccupied surface state. RA spectroscopy is found to be sensitive to the exposure of Ni(110) to CO.