Abstract
The room temperature interaction of oxygen with Cu(111) surfaces was studied at exposures of up to 10 6 L by low energy electron diffraction (LEED), Auger electron spectroscopy (AES) and surface potential (SP) measurements. Three distinct stages in the interaction were discernible from both AES and SP measurements, the first two being adsorption and incorporation of oxygen into the Cu lattice. The final stage was also characterised by the appearance of a |− 3 1 2 2 | structure in LEED, and is interpreted in terms of a surface reconstruction, the LEED results being fitted to three rotational domains of a distorted Cu(100)−( 2 × 2 ) R45° structure on the Cu(111) substrate. CO reduction of the oxidised surface produced somewhat different results on re-oxidation marked by the absence of the third stage SP change and the appearance of a complex LEED pattern at high exposures.
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