Journal Title

Physical Review B

Publication Date

11-15-1980

Abstract

Using a scanning transmission electron microscope it is possible, by directly imaging single atoms, to investigate the motion and distribution of heavy (high-Z) atoms deposited on the surfaces of thin low-Z films. In this study, the heavy atoms U, Pt, Au, In, Cd, Ag, and Pd were deposited on 15-Å-thick amorphous carbon substrates. It is found that adatom motion is strongly dependent upon local substrate structure and adatom species. Diffusion coefficients and activation energies for single atoms, as well as dimers, trimers, etc., have been obtained by directly measuring the motion of the atoms. Pair-density and nearest-neighbor distributions were measured and used to derive the interatomic potential and the rate of adatom nucleation. It is found that the interatomic potential is very weak and long ranged.

Subjects

Atoms

Publication Information

Copyright 1980 American Physical Society. The original published version of this article may be found at http://dx.doi.org/10.1103/PhysRevB.22.4650.

DOI

10.1103/PhysRevB.22.4650

Peer-Reviewed

Yes

Document Type

Journal Article

Included in

Physics Commons

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