Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/59185
Type: Artigo
Title: Pd on Cu(111) studied by photoelectron diffraction
Author: Siervo, A. de
Soares, E. A.
Landers, R.
Fazan, T. A.
Morais, J.
Kleiman, G. G.
Abstract: The PdCu alloy system, which has important catalytic properties, has been the subject of many experimental and theoretical studies using a large number of different techniques. Theoretical and experimental structural studies converge in predicting ordered alloys for the Pd/Cu(1 1 0) and Pd/Cu(1 0 0) surfaces. No such agreement exists for the Pd/ Cu(1 1 1) surface, however; indeed, few structural studies have been performed for this surface. Here, we report the first application of X-ray photoelectron diffraction (XPD) (using synchrotron radiation) in combination with LEED to determine the structure of ultra-thin epitaxial Pd films (~ 1 ML) evaporated on Cu(1 1 1) single crystal surfaces. The analysis of the data was performed with the multiple scattering diffraction program of Chen and Van Hove. For the preparation condition used, a random surface alloy seems to form in the first three layers. The first interlayer distance expands whereas the second seems to contract.
The PdCu alloy system, which has important catalytic properties, has been the subject of many experimental and theoretical studies using a large number of different techniques. Theoretical and experimental structural studies converge in predicting ordered alloys for the Pd/Cu(1 1 0) and Pd/Cu(1 0 0) surfaces. No such agreement exists for the Pd/ Cu(1 1 1) surface, however; indeed, few structural studies have been performed for this surface. Here, we report the first application of X-ray photoelectron diffraction (XPD) (using synchrotron radiation) in combination with LEED to determine the structure of ultra-thin epitaxial Pd films (~ 1 ML) evaporated on Cu(1 1 1) single crystal surfaces. The analysis of the data was performed with the multiple scattering diffraction program of Chen and Van Hove. For the preparation condition used, a random surface alloy seems to form in the first three layers. The first interlayer distance expands whereas the second seems to contract.
Subject: Ligas (Metalurgia)
Cobre
Paládio
Fotoemissão
Espectroscopia fotoeletrônica de raio X
Difração eletrônica em baixa energia
Country: Holanda
Editor: Elsevier
Citation: Surface Science. Elsevier Science Bv, v. 504, n. 41699, n. 215, n. 222, 2002.
Rights: fechado
Identifier DOI: 10.1016/S0039-6028(02)01097-X
Address: https://www.sciencedirect.com/science/article/pii/S003960280201097X
Date Issue: 2002
Appears in Collections:IFGW - Artigos e Outros Documentos

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