Characterization of Rh films on Ta(110)

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)

DOI:https://doi.org/10.1116/1.576694· OSTI ID:6820948

Jiang, L Q; Ruckman, M W; Strongin, M ^[1]

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1. Physics Department, Brookhaven National Laboratory, Upton, NY (USA)

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 (LEED) and low-energy ion scattering (LEIS). From the variation of the Rh Auger peak-to-peak intensity as a function of evaporation time, Rh 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 {minus}1.5 and {minus}2.5 eV binding energy during the initial phase of thin-film growth (0{lt}{theta}{lt}0.5 ML). By 0.75 ML Rh coverage, these states merge into a broad structure centered near {minus}2 eV binding energy. Photoemission peaks typical of a Rh(111) surface are seen at higher coverages ({theta}{gt}3.7 ML). CO dissociates on the Rh/Ta(110) surface for Rh coverages{lt}2.5 ML and the surface develops a site capable of molecular CO adsorption above 0.3-ML Rh coverage.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6820948
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Vol. 8:3; ISSN JVTAD; ISSN 0734-2101
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
AUGER ELECTRON SPECTROSCOPY
BINDING ENERGY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COHERENT SCATTERING
DIFFRACTION
DISSOCIATION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
EMISSION
ENERGY
FILMS
METALS
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
PLATINUM METALS
RHODIUM
SCATTERING
SECONDARY EMISSION
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
TANTALUM
THIN FILMS
TRANSITION ELEMENTS