Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Diffusion on and in Surfaces: The Atomic Slide Puzzle
Abstract This paper presents first results from scanning tunneling microscopy measurements, which show that a close-packed terrace of a metal surface can be far from static, even at temperatures as low as room temperature. We make the motion visible of the atoms in a Cu(OO1) terrace, by embedding a low density of In atoms in the first Cu layer. The peculiar characteristics of the motion of the In show that the diffusion of surface vacancies is responsible for a continual reshuffling of all the (In and Cu) atoms in the first layer. A comparison with model calculations of the statistics of the vacancy-assisted motion of terrace atoms shows there must be an attractive interaction between an embedded In atom and a vacancy, which makes the In atom somewhat more mobile than a Cu surface atom. Such an attraction is indeed found in Embedded Atom Method calculations.
Diffusion on and in Surfaces: The Atomic Slide Puzzle
Abstract This paper presents first results from scanning tunneling microscopy measurements, which show that a close-packed terrace of a metal surface can be far from static, even at temperatures as low as room temperature. We make the motion visible of the atoms in a Cu(OO1) terrace, by embedding a low density of In atoms in the first Cu layer. The peculiar characteristics of the motion of the In show that the diffusion of surface vacancies is responsible for a continual reshuffling of all the (In and Cu) atoms in the first layer. A comparison with model calculations of the statistics of the vacancy-assisted motion of terrace atoms shows there must be an attractive interaction between an embedded In atom and a vacancy, which makes the In atom somewhat more mobile than a Cu surface atom. Such an attraction is indeed found in Embedded Atom Method calculations.
Diffusion on and in Surfaces: The Atomic Slide Puzzle
Frenken, J. W. M (Autor:in) / Gastel, R. (Autor:in) / Albada, S. B. (Autor:in) / Somfai, E. (Autor:in) / Saarloos, W. (Autor:in)
01.01.2001
9 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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