Inhomogeneous contraction of interatomic distances in metallic clusters: Calculations for Csn and OCsn
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1991-10-01Derechos
© 1991 The American Physical Society
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Physical Review. B, Condensed Matter, vol. 44, Num. 14, pag. 7273-7282, 1991
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American Physical Society
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Abstract:
The equilibrium geometrical structures of Csn and OCsn clusters have been obtained by a method
that, in the framework of density-functional theory, describes the ion-electron interaction by means of a
pseudopotential that is spherically averaged about the cluster center. In the size range studied (up to
n =78 and 70, respectively) the clusters present well-separated atomic layers for which the distances to
the two closest neighbors of each atom have been analyzed, showing that there is an inhomogeneous
shrinking of the geometrical structure, in the sense that the distances obtained for atoms in the inner layers
are lower than those for the outer ones. The analysis of the growing of the clusters suggests that the
equilibrium geometries are those for which any atom of the aggregate has its closest neighbor at a distance
lower than the nearest-neighbor distance of the pure bulk metal. For small (n ≤ 20) pure clusters,
geometries of high symmetry have been found, which are completely modified by the presence of the oxygen
impurity. A regular octahedron is formed around the oxygen atom in most cases.
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