Initial stages of oxidation of Mg(0001) and the role of co-adsorbed alkali metals

Soft X-ray Mg 2p photoemission using synchrotron radiation at moderate spectral resolution has been used to investigate the early stages of oxidation of Mg(0001) with and without preadsorbed Na or K. On the alkali-free surface, some evidence is found for a state characterized by a chemical shift int...

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Bibliographic Details
Published in:Journal of electron spectroscopy and related phenomena 1999-01, Vol.98-99, p.235-244
Main Authors: Driver, S.M, Lüdecke, J, Jackson, G.J, Woodruff, D.P
Format: Article
Language:English
Subjects:
Alkali metals
Core level photoemission
Dissociation
Low index single crystal surface
Magnesium
Oxidation
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Summary:Soft X-ray Mg 2p photoemission using synchrotron radiation at moderate spectral resolution has been used to investigate the early stages of oxidation of Mg(0001) with and without preadsorbed Na or K. On the alkali-free surface, some evidence is found for a state characterized by a chemical shift intermediate between that of the metallic and oxidic states, but the limited resolution and overlapping spin-orbit split surface and bulk metallic components precludes more thorough characterization. Preadsorbed Na or K enhance the initial rate of oxidation by approximately a factor of two. It is suggested that the mechanism is an enhancement of the rate of oxygen dissociation.
ISSN:0368-2048
1873-2526
DOI:10.1016/S0368-2048(98)00289-8