Interaction of ultrathin films of Cu with Rh(100) and Ru(0001): An XPS study
- Texas A and M Univ., College Station (United States)
The interaction of ultrathin films of Cu with Rh(100) and Ru(0001) has been examined by using X-ray photoelectron spectroscopy (XPS). The effects of surface annealing temperature, adsorbate coverage (film thickness), and CO chemisorption were investigated. The XPS data show that the atoms in a monolayer of Cu supported on Rh(100) or Ru(0001) are electronically perturbed with respect to the surface atoms of Cu(100). The magnitude of the electronic pertubations is larger for Cu/Rh(100). Measurements of the Cu(2p{sub 3/2}) XPS peak position of Cu/Rh(100) and Cu/Ru(0001) as a function of film thickness show that the Cu-Rh and Cu-Ru interactions affect the electronic properties of two or three layers of Cu atoms. The present results show a correlation between the shifts in the XPS surface core-level binding energies and the variations in the desorption temperatures of CO from Cu adlayers. The shifts in XPS binding energies and CO desorption temperatures can be explained in terms of (1) variations that occur in the Cu-Cu interaction when Cu adopts the lattice parameters of Rh(100) or Ru(0001) in a pseudomorphic adlayer and (2) modifications in the electronic properties of the Cu adatoms, caused by the Cu-Rh and Cu-Ru interactions. Chemisorption of CO induces a large decrease in the electron density of the Cu adlayers.
- OSTI ID:
- 5731196
- Journal Information:
- Journal of Physical Chemistry; (United States), Vol. 95:6; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON MONOXIDE
CHEMISORPTION
COPPER
SURFACE PROPERTIES
RHODIUM
RUTHENIUM
ANNEALING
BINDING ENERGY
CORRELATIONS
DESORPTION
ELECTRON DENSITY
ENERGY LEVELS
MILLER INDICES
PHOTOELECTRON SPECTROSCOPY
THIN FILMS
X-RAY SPECTROSCOPY
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
FILMS
HEAT TREATMENTS
METALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties