Multiple Oxidation States of Al Observed by Photoelectron Spectroscopy of Substrate Core Level Shifts

Substrate core chemical shifts upon chemisorption of O on Al are observed using variable-excitation-energy photoelectron spectroscopy. At low exposures a unique intermediate oxidation state evolves where the Al 2p level is shifted by only 1.3 eV toward higher binding energy as compared to the 2.6 eV...

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Bibliographic Details
Published in:Physical review letters 1976-11, Vol.37 (19), p.1282-1285
Main Authors: Flodstrom, S. A., Bachrach, R. Z., Bauer, R. S., Hagström, S. B. M.
Format: Article
Language:English
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Summary:Substrate core chemical shifts upon chemisorption of O on Al are observed using variable-excitation-energy photoelectron spectroscopy. At low exposures a unique intermediate oxidation state evolves where the Al 2p level is shifted by only 1.3 eV toward higher binding energy as compared to the 2.6 eV shift observed for heavily oxidized Al (Al2O3). Simultaneous observation of the O 2p resonance shows evidence for a sharp phase change at exposures close to monolayer formation. 15 ref.--AA.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.37.1282