Abstract

The structure of the smallest clusters of atoms forming during thin film deposition is considered. It is proposed that, for films forming via the Volmer- Weber or three-dimensional particle growth mode, these microclusters will have well-defined, tightly bound, low energy, non-crystalline structures. These predicted structures are based on published least energy configuration calculations. Evidence to support the proposed structures is presented from observations of gold deposits made on sodium chloride surfaces cleaved under ultrahigh vacuum conditions at temperatures ranging down to −150°C. The direct observation of such structures may soon be possible through scanning tunnelling microscopy.

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