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Citation 21
Accession Number
005683220
Author
Canney SA
.
Vos M
.
Kheifets
AS
.
Guo X
.
McCarthy IE
.
Weigold E
.
Institution
Electron. Structure of Mater. Centre, Flinders Univ. of South Australia,
Adelaide, SA, Australia.
Title
Electron momentum spectroscopy studies on the oxidation of aluminium.
Source
Surface Science, vol.382, no.1-3, 20 June 1997, pp.241-57. Publisher:
Elsevier, Netherlands.
Abstract
Electron momentum spectroscopy has been used to measure the electronic structure of aluminium after exposure to increasing amounts of oxygen. The experimental valence band results showed the structural features of aluminium oxide beginning to dominate the free electron contribution of metallic aluminium as the exposure increased. The interpretation of this is that the aluminium oxide layer increases in thickness as the exposure increases, eventually saturating at a thickness of about 15 AA. After subtracting the intensity of the underlying Al metal contribution from the oxidised states the valence band features of aluminium oxide were resolved even after exposure to only 600 L of oxygen. It is estimated that only about 5 AA of aluminium oxide is formed at this stage. A quantitative comparison was made to a linear muffin-tin orbital (LMTO) calculation for spherically averaged alpha -Al/sub 2/O/sub 3/. Best agreement was obtained for the results of the lowest oxygen exposure (600 L). The chemical shifts of the Al 2p core level were also measured in separate experiments for two intermediate oxygen exposures between the aluminium and aluminium oxide cases for further characterisation. These measurements show that electron momentum spectroscopy is able to obtain the electron bands and the momentum densities of very thin disordered surface layers. (25 References).