Abstract
Oxygen adsorption on tungsten has been studied at high temperature by Auger electron spectroscopy using a special object stage with small cylindrical object and electron bombardment heating. No temperature effects has been observed on the character of Auger electron spectra up to 3000 K. The study of the decarbonisation process of tungsten shows that small contamination of carbon on the surface influences strongly the equilibrium oxygen coverage. Adsorption isotherms of carbon free surfaces has been measured up to 10-4 Torr in the temperature range from 1600 K to 2700 K on polycrystal faces. The measured isotherms can be interpreted assuming rather a second order desorption. A specially formed object has been used to investigate whether the electron bombardment heating is influencing the adsorption equilibrium but no influence on adsorption isotherms has been found.
Published Version
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