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Título: Structure and bonding in small neutral alkali halide clusters
Autor: Aguado, Andrés
Ayuela, Andrés
López, José Manuel
Alonso, Julio A.
Año del Documento: 1997
Editorial: The American Physical Society
Descripción: Producción Científica
Documento Fuente: Physical Review B, v. 56, n. 23, (1997) p. 15353-15360
Resumen: The structural and bonding properties of small neutral alkali halide clusters, (AX)_n with n<10, A=Li^+,Na^+,K^+,Rb^+, and X=F^-,Cl^-,Br^-,I^-, are studied using the ab initio perturbed ion (PI) model and a restricted structural relaxation criterion. A trend of competition between rocksalt and hexagonal ringlike isomers is found and discussed in terms of the relative ionic sizes. The main conclusion is that an approximate value of r_C /r_A=0.5 (where r_C and r_A are the cationic and anionic radii) separates the hexagonal from the rocksalt structures. The classical electrostatic part of the total energy at the equilibrium geometry is enough to explain these trends. The magic numbers in the size range studied are n=4, 6, and 9, and these are universal since they occur for all alkali halides and do not depend on the specific ground-state geometry. Instead those numbers allow for the formation of compact clusters. Full geometrical relaxations are considered for (LiF)_n (n=3 – 7) and (AX)_3 clusters, and the effect of Coulomb correlation is studied in a few selected cases. These two effects preserve the general conclusions achieved thus far.
Materias (normalizadas): Física
Revisión por Pares: SI
DOI: 10.1103/PhysRevB.56.15353
Version del Editor: http://link.aps.org/doi/10.1103/PhysRevB.56.15353
Propietario de los Derechos: © Todos los derechos reservados
Idioma: eng
URI: http://uvadoc.uva.es/handle/10324/2513
Derechos: info:eu-repo/semantics/restrictedAccess
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