SODIUM-PROMOTED OXIDATION OF AL(111) STUDIED BY CORE-LEVEL PHOTOEMISSION SPECTROSCOPY
UNSPECIFIED. (1993) SODIUM-PROMOTED OXIDATION OF AL(111) STUDIED BY CORE-LEVEL PHOTOEMISSION SPECTROSCOPY. JOURNAL OF PHYSICS-CONDENSED MATTER, 5 (27). pp. 4677-4686. ISSN 0953-8984Full text not available from this repository.
The influence of preadsorbed sodium on the early stages of oxidation of Al(111) has been investigated using synchrotron radiation photoemission measurements of the Al and Na 2p states. There is a strong promotion (by a factor of up to 100 or more) of the rate of oxygen dissociation and formation of the three-dimensional oxide induced by the presence of the sodium. At the highest Na coverage of 0.33 ML (associated with the Al(111) (square-root 3 x square-root 3)R30-degrees-Na phase), the Al 2p chemically shifted states characteristic of the chemisorption precursor to oxidation seen on the Na-free surface are no longer observed. However, a state of intermediate chemical shift is seen in the Na 2p photoemission peak, at much lower oxygen exposures, and appears to be a characteristic of a new oxidation precursor.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||JOURNAL OF PHYSICS-CONDENSED MATTER|
|Publisher:||IOP PUBLISHING LTD|
|Official Date:||5 July 1993|
|Number of Pages:||10|
|Page Range:||pp. 4677-4686|
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