Characterization of Rh films on Ta(110)

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5684352

Jiang, L Q; Ruckman, M W; Strongin, M

The surface and electronic structure of Rh films on Ta(110) up to several monolayers thick on Ta(110) are characterized by photoemission, Auger emission, low energy electron diffraction and low energy ion scattering. From the variation of the Rh Auger peak-to-peak intensity as a function of evaporation time, Rh/Ta(110) appears to grow in the Stranski-Krastanov mode at room temperature. However, the LEIS data show that the Rh adatoms begin to cluster on Ta(110) before growth of the monolayer is completed. Diffuse LEED scattering suggests that the Rh films are disordered. Photoemission shows that Rh chemisorption on Ta(110) generates two peaks located at 1.2 and 2. 5 eV binding energy during the initial phase of thin film growth (0 < {Theta} < 0.5 ML). By 0.75 ML Rh coverage, those states merge into a broad structure centered near 2 eV binding energy. Photoemission peaks typical of a Rh(111) surface are seen at higher coverages ({Theta} > 3.7 ML). Photoemission data for CO covered surfaces show that CO dissociates on the Rh/Ta(110) surface for Rh coverages less than 2.5 ML and also show that the Rh clusters develop at least one site capable of molecular CO adsorption above 0.3 ML Rh coverage. 38 refs., 5 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5684352
• Report Number(s): BNL-43284; CONF-891093--5; ON: DE90001323
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals &amp; Alloys-- Structure &amp; Phase Studies
360104* -- Metals &amp; Alloys-- Physical Properties
ADSORPTION
BINDING ENERGY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRONIC STRUCTURE
ELEMENTS
EMISSION
ENERGY
FILMS
METALS
NIOBIUM
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PHOTOEMISSION
PLATINUM METALS
RHODIUM
SCATTERING
SECONDARY EMISSION
SORPTION
SUBSTRATES
SURFACE PROPERTIES
TANTALUM
THIN FILMS
TRANSITION ELEMENTS