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Zusammenfassung:
The clean, carbon monoxide- and oxygen-covered surfaces of a [110]-oriented Pt tip were studied in the lithium field desorption microscope (Li FDM). Surface diffusion of Li on clean, carbon monoxide- and oxygen-covered Pt surfaces was investigated with field electron microscopy. A correlation between the peculiarities of the field-stimulated surface diffusion of Li on surfaces of bcc and fcc crystals, and the different mechanism of Li FDM image formation of W and Pt are observed and discussed in terms of sub- and multilayer Li surface diffusion. The catalytical CO-oxidation reaction on Pt was visualized in Li FDM. The influence of the Li on the CO-oxidation process was observed and discussed on the basis of present experimental data and known alkali-gas coadsorption properties.
