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Volume 211, number 2,3 CHEMICAL PHYSICSLETTERS 13August 1993 HREEL spectra of various oxygen structures on Rh( 110)
 

Summary: Volume 211, number 2,3 CHEMICAL PHYSICSLETTERS 13August 1993
HREEL spectra of various oxygen structures on Rh( 110)
D. Alf2 a, P. Rudolf b, M. Kiskinova b*cand R. Rosei `J
a Dipariimento di Fisica, Universitb degli Studi di Trieste, ViaA. Valerio 2, 34127 Trieste, Italy
b Laboratorio TASC-INFM, Padriciano 99, 34012 Tries&, Italy
c Sincrotrone Trieste, Padriciano 99, 34012 Trieste, Italy
Received 10May 1993;in final form 16June 1993
High-resolution electron energy loss spectroscopy and low electron energy diffraction have been used to study ordered and
disordered layers of oxygenadsorbed on the Rh( 110) surface at different temperatures. It has beenfoundthat at temperatures of
90-120 K, low coverages of disordered atomic oxygen produce a single vibrational mode at 72 meV which is replaced by two
losses at 45 and 63 meV when an ordered (2x 1)p2mg monolayer is formed. Losses at 47 and 65 meV characterize the adsorbed
oxygen in the (2X2)p2mg, (2~3)p2m& and c(2X2n) structures produced at elevated temperatures, which involve reconstruc-
tion of the substrate. The changes in the vibrational spectra are explained in the framework of structural models where oxygen
occupies different adsorption sites.
1.Introduction
The adsorption of oxygen on fee ( 110) metal sur-
faces usually leads to the formation of ordered struc-
tures involving restructuring of the substrate surface.
Recently, a number of studies of oxygen adsorption
on Rh( 110) have shown that depending on the

  

Source: Alfè, Dario - Departments of Earth Sciences & Physics and Astronomy, University College London

 

Collections: Physics; Geosciences