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Structure of Rh&[;110&];(1x2) and Rh&[;110&]; (2x2)p2mg-O surfaces

โœ Scribed by C. Comicioli; V.R. Dhanak; G. Comelli; C. Astaldi; K.C. Prince; R. Rosei; A. Atrei; E. Zanazzi

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
432 KB
Volume
214
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The structure of the oxygen-induced Rh{ 110) (2x 2)p2mg-O phase has been determined using low-energy electron diffraction intensity-voltage (LEED 1-k') analysis, and consists of a missing row reconstructed substrate with oxygen atoms in a zigzag arrangement. The oxygen atoms occupy the upper threefold sites on the { 11 I} microfacets, and the nearest-neighbour bonding geometry is the same as for the (2x 1) oxygen-induced low-temperature phase. In spite of the similar geometries, the reactivities of these structures for CO oxidation are very different. When the oxygen is removed from the (2 ~2)p2mg surface at low temperature, the substrate retains the ( 1 x2) missing row reconstruction. LEED analysis of the (1 X 2) surface indicates that the first interlayer contraction is 1196, which is lower than the value determined previously by He scattering.

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