Spectroscopic ellipsometric investigation of the clean and oxygen exposed Ni(110) surface

Hanekamp, L.J. and Brader, S.J.H. and Bootsma, G.A. (1983) Spectroscopic ellipsometric investigation of the clean and oxygen exposed Ni(110) surface. Surface Science, 135 (1-3). pp. 383-395. ISSN 0039-6028

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Abstract:	Dynamical ellipsometric investigations of the initial oxidation of the Ni(110) surface have been performed. Ellipsometry appears to be well suited to distinguish between chemisorbed oxygen and nickel oxide on the surface. Annealing at 740 K causes the nucleation of nickel oxide to proceed faster than at 570 K. After equal exposures however, the nucleation is slower with an oxygen pressure of 2 × 10−7 Torr than with a pressure of 1.3 × 10−8 Torr. Spectroscopic ellipsometric measurements (400–800 nm) have been performed on clean and oxygen-exposed (at saturation) Ni(110) surfaces. The complex dielectric function of the clean surface has been determined. To explain the results of the oxygen exposed surface a model is discussed — a surface layer with a thickness of 6 Å and a mixture of 90% NiO and 10% Ni — in which changes with substrate optical properties are taken into account.
Item Type:	Article
Copyright:	© 1983 Elsevier Science
Research Group:	Solid State Physics (VSF)
Link to this item:	http://purl.utwente.nl/publications/69220
Official URL:	http://dx.doi.org/10.1016/0039-6028(83)90231-5
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