Abstract
The interaction of oxygen with Ni(110) surfaces was investigated from 85 to 800 K by AES. ELS, TDS and work function changes (Δø). At T = 300 K three different phases of oxygen bonding are observed: (1) Chemisorption of oxygen up to 0.6–0.8 L accompanied by an increase of work function and a kinetic energy shift of the O(KLL) Auger spectra ( ΔE = 1.1 eV). (2) A rearrangement of the chemisorption layer and incorporation of oxygen into the Ni sublayer associated with further oxygen uptake, characterized by a decrease of Δø per adsorbed oxygen atom. (3) Nucleation and island growth of NiO indicated by a decrease of Δø, shifts of the oxygen and Ni Auger transitions to lower kinetic energy and drastic changes in ELS and AES line shape. Low temperature adsorption experiments indicate the existence of a molecular oxygen species — marked in TDS by a partial desorption of oxygen at 250 K — and characterized by the electron spectroscopic investigations and Δø measurements.
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