Abstract
Abstract An initial stage of oxidation of a cesium-covered Ni (1 1 0) surface has been studied by metastable-induced electron spectroscopy (MIES) and low-energy electron diffraction (LEED). The MIES brought spectra with Cs 6s induced peak (P 6s ), Cs 5p (P 5p ), O 2p induced peak (P ox ) and a structure related to the substrate Ni 3d states (P 3d ). The work function change Δ φ showed an oscillatory behavior in the progress of surface oxidation. The process is divided into three stages: (i) at low O 2 exposures, Δ φ > 0 with unchanging P 5p and P 6s ; (ii) at moderate exposures, Δ φ 6s intensity; (iii) at higher exposures, Δ φ > 0 with shifts of peaks P 5p and P ox to higher energies, together with an appearance of peak P 3d . A three-step model of initial oxidation of alkali-covered Ni (1 1 0) surfaces is presented.
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