Formation and Structural Analysis of a Surface Alloy: Al(111)-(2 × 2)-Na
- 27 February 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 74 (9) , 1617-1620
- https://doi.org/10.1103/physrevlett.74.1617
Abstract
The Al(111)-(2 × 2)-Na phase formed by adsorption of one-half monolayer Na at 300 K is shown to be a surface alloy. Quantitative agreement is achieved between the results of structure determinations by low energy electron diffraction, surface extended x-ray adsorption fine structure, and total energy calculations. The first four layers of the structure are shown to consist of a Na-Al-Na sandwich on a reconstructed Al substrate layer. It is suggested that the formation of the structure involves surface steps as sources of Al atoms.Keywords
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