Leed and Aes study of the Au/AuPb2 interface |
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Authors: | Jean-Paul Biberian |
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Institution: | 1. Laboratoire de Métallurgie et Physico-chimie des Surfaces, Université Pierre et Marie Curie, 11, rue Pierre et Marie Curie, 75231 Paris Cédex 05, France;2. Centre des Mécanismes de la Croissance Cristalline, UER Scientifique de Luminy, 70, route Léon Lachamp, 13288 Marseille Cédex 2, France |
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Abstract: | The adsorption of lead on gold at room temperature in UHV conditions has been studied by LEED and AES. We review some of the data obtained on the Au(100), (111), and (110) faces, published elsewhere, and we give some new experimental results on the stepped Au(S) n(100) × (111)] (with n = 3, 4, 5, and 6) faces. On all these faces, as lead is deposited on the gold substrate it first forms a monolayer of lead, then a compound AuPb2. Using the LEED and Auger data we give a model of the epitaxy with a layer-by-layer growth mechanism. We propose a model which involves a transition alloy wich forms at the interface Au/AuPb2. This model is in agreement with the LEED diagrams observed before the one corresponding to bulk AuPb2. In the case of the epitaxy of lead on gold (100), we calculate the Auger peak-to-peak ] heights of the gold (72 eV) and lead (93 eV) transitions versus coverage. We obtain good agreement with the experimental data, assuming that the first and last layers of the alloy are lead monolayers and diffusion of lead in gold as well as gold in lead. |
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