STRUCTURE OF RH(110)(1X2) AND RH(110) (2X2)P2MG-O SURFACES

Citation
C. Comicioli et al., STRUCTURE OF RH(110)(1X2) AND RH(110) (2X2)P2MG-O SURFACES, Chemical physics letters, 214(5), 1993, pp. 438-442
Citations number
26
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
ISSN journal
00092614
Volume
214
Issue
5
Year of publication
1993
Pages
438 - 442
Database
ISI
SICI code
0009-2614(1993)214:5<438:SORAR(>2.0.ZU;2-Q
Abstract
The structure of the oxygen-induced Rh{110}(2x2)p2mg-O phase has been determined using low-energy electron diffraction intensity-voltage (LE ED I-V) analysis, and consists of a missing row reconstructed substrat e with oxygen atoms in a zigzag arrangement. The oxygen atoms occupy t he upper threefold sites on the {111} microfacets, and the nearest-nei ghbour bonding geometry is the same as for the (2 x 1) oxygen-induced low-temperature phase. In spite of the similar geometries, the reactiv ities of these structures for CO oxidation are very different. When th e oxygen is removed from the (2 x 2)p2mg surface at low temperature, t he substrate retains the (1 x 2) missing row reconstruction. LEED anal ysis of the (1 x 2) surface indicates that the first interlayer contra ction is 11%, which is lower than the value determined previously by H e scattering.