Physics – Condensed Matter – Materials Science
Scientific paper
1998-04-24
Surf. Sci. 410, L721-L726 (1998)
Physics
Condensed Matter
Materials Science
5 pages, 3 figures, to appear in Surf. Sci. Lett. Related papers available at http://neon.cchem.berkeley.edu/~dani/He-papers.h
Scientific paper
10.1016/S0039-6028(98)00320-3
An approach based on He scattering is used to develop an atomic-level structural model for an epitaxially grown disordered sub-monolayer of Ag on Pt(111) at 38K. Quantum scattering calculations are used to fit structural models to the measured angular intensity distribution of He atoms scattered from this system. The structure obtained corresponds to narrowly size-dispersed compact clusters with modest translational disorder, and not to fractals which might be expected due to the low surface temperature. The clusters have up to two layers in height, the lower one having few defects only. The relations between specific features of the angular scattering distribution, and properties such as the cluster sizes and shapes, the inter-cluster distance distribution etc., are discussed. The results demonstrate the usefulness of He scattering as a tool for unraveling new complex surface phases.
Comsa George
Gerber Benny R.
Krzyzowski M. A.
Lidar Daniel A.
Yinnon Tamar A.
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