Abstract
The gasification of surface carbon by oxygen on Fe(100) was studied by AES and LEED. The iron surface was carburized by thermal decomposition of ethylene. Quasi-simultaneous AES measurements of the carbon and oxygen coverages reveal that upon reaction of a carbon adlayer on Fe(100) with oxygen in the temperature range of 423 to 573 K, carbon atoms are replaced by oxygen atoms while CO desorbs. Further oxidation of the subsurface region was observed after the carbide layer on Fe(100) was almost completely removed by oxygen. At crystal temperatures between 298 and 423 K it was not possible to remove the total amount of carbon since the carbide layer on Fe(100) was simultaneously covered with an oxide layer.
Published Version
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