Interaction of ultrathin films of Cu with Rh(100) and Ru(0001): An XPS study

Journal Article · Thu Mar 21 04:00:00 EST 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100159a068· OSTI ID:5731196

Rodriguez, J A; Campbell, R A; Goodman, D W ^[1]

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1. 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), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:6; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ANNEALING
BINDING ENERGY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COPPER
CORRELATIONS
DESORPTION
ELECTRON DENSITY
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
ENERGY LEVELS
FILMS
HEAT TREATMENTS
METALS
MILLER INDICES
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PLATINUM METALS
RHODIUM
RUTHENIUM
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
THIN FILMS
TRANSITION ELEMENTS
X-RAY SPECTROSCOPY