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Tensor LEED analysis for the electrodeposited Pt(111)-(3x3)-Ag,I surface structure

TitleTensor LEED analysis for the electrodeposited Pt(111)-(3x3)-Ag,I surface structure
Publication TypeJournal Article
Year of Publication2001
AuthorsLabayen, M, Harrington, DA, Saidy, M, Mitchell, KAR
JournalSurface Science
Volume490
Pagination256-264
Date PublishedSep
Type of ArticleArticle
ISBN Number0039-6028
KeywordsADSORBATES, ADSORPTION, AG, chemisorption, ELECTROCHEMISTRY, ENERGY-ELECTRON-DIFFRACTION, IODINE, LOW ENERGY ELECTRON DIFFRACTION (LEED), METAL-SURFACES, platinum, PT(111), SCANNING-TUNNELING-MICROSCOPY, silver
Abstract

A crystallographic analysis is reported using low-energy electron diffraction (LEED) in the tensor LEED approach for the electrodeposited coadsorption (3 x 3) structure with 4/9 monolayer (ML) of silver and 4/9 ML of iodine on the Pt(1 1 1) surface. The structure approximates a two-layer slice of bulk AgI cut parallel to its (1 1 1) plane and superimposed on the substrate with the Ag atoms in contact with the topmost Pt(1 1 1) layer, and the I atoms forming an overlayer on the Ag atoms. There are two types of Ag atoms in the (3 x 3) unit mesh; one type bonds to a single Pt atom, while the other type bonds to three Pt atoms. The average Ag-Pt bond distances are close to 2.48 and 2.82 (A) over circle respectively for the one and three-coordinate Ag atoms, but both types of Ag atoms bond to three I atoms with an average Ag-I distance of 2.67 (A) over circle. No significant corrugation is observed for either the I layer or the Ag layer. (C) 2001 Elsevier Science B.V. All rights reserved.

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