✍ Scribed by W. Arabczyk; D. Moszyński; U. Narkiewicz
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The adsorption states of sulphur, phosphorus, carbon and nitrogen on the single crystal Fe(1 1 1) surface have been studied using the Auger electron spectroscopy. The AES spectra for high surface concentration of non-metals differ from these obtained for atomic adsorption states. The change of the AES line shape has been observed for all non-metals under the study. The observed changes have been explained on the basis of the model of the electronic structure and interpreted as a formation of the Fe-X-X bonds. For carbon and phosphorus a formation of three dimensional structure is observed. For sulphur adsorption and nitrogen segregation only a formation of X has been observed. The formation of X-X bonds weakens the iron-non-metal interaction. The effect of the coadsorbed electron-acceptor element (oxygen) on the state of the chemisorbed non-metal (sulphur) has been discussed, either.
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