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LEED crystallographic analysis for the Rh(111)-(2x1)-O surface structure

TitleLEED crystallographic analysis for the Rh(111)-(2x1)-O surface structure
Publication TypeJournal Article
Year of Publication1996
AuthorsWong, KC, Liu, W, Mitchell, KAR
JournalSurface Science
Volume360
Pagination137-143
Date PublishedJul
Type of ArticleArticle
ISBN Number0039-6028
KeywordsCLOSE-PACKED SURFACE, EJECTION, ENERGY-ELECTRON-DIFFRACTION, LAYER, low energy electron diffraction, low index single crystal surfaces, OXYGEN, P(2X2)O/RH(111), RECONSTRUCTION, RELAXATIONS, RH(111), rhodium, surface relaxations, THERMAL-DESORPTION
Abstract

A tensor LEED analysis is reported For the Rh(111)-(2 x 1)-O surface structure in which atoms in the O overlayer chemisorb close to the regular (fcc type) three-fold hollow sites for half-monolayer coverage. The structure shows significant relaxations: for example, a buckling of about 0.07 Angstrom is indicated in the first metal layer and O appears to displace laterally by about 0.05 Angstrom. The individual O-Rh bond lengths are around 2.01 and 1.92 Angstrom to top layer Rh atoms, which bond to two and one O atoms, respectively, but the average value (1.98 Angstrom) is close to that in bulk RhO2 (1.96 Angstrom). Comparison is also made with the previously determined O-Rh bond lengths in the Rh(110)-p2mg(2 x 1) surface structure.

URL<Go to ISI>://A1996UX92300022