[ital C](2[times]2) oxygen-induced core-level shifts and surface states of Pd(100)
- Zettlemoyer Center for Surface Studies and Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015 (United States)
Surface states induced by the [ital C](2[times]2) phase of oxygen on a Pd(100) surface were studied by means of surface core-level-shift (SCLS) spectroscopy and photoelectron angular distributions that were obtained by using forward-scattering spectroscopy. This combination of the two powerful techniques proved to be very useful in that surface and bulk states were observed to have two distinct energies as determined by the SCLS spectroscopy applied to the Pd 3[ital d][sub 5/2] and 3[ital d][sub 3/2] core levels. Angular distributions of the surface and bulk components of the Pd 3[ital d][sub 5/2] core level were studied separately. Photoelectron angular distributions were found to be consistent with the forward-scattering mechanism in which the same Pd atom residing in its lattice site gives raise to two distinct 3[ital d][sub 5/2] photoemission peaks separated by 0.55 eV. Forward-scattering results obtained along the [l angle]001[r angle] and the [l angle]011[r angle] directions also suggest that [ital surface] [ital states] [ital extend] [ital four] [ital to] [ital five] [ital layers] [ital into] [ital the] [ital bulk] and they can be characterized by a wave function whose amplitude decays in the direction of the inward normal. Coefficients of the atomic orbitals that represent oxygen-induced surface states were mapped experimentally. Structural and mechanistic implications of the long-range nature of the O-Pd interaction are discussed.
- DOE Contract Number:
- FG02-86ER13580
- OSTI ID:
- 7207519
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:20; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
ANGULAR DISTRIBUTION
CHEMICAL REACTIONS
D STATES
DISTRIBUTION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY LEVELS
EPITAXY
METALS
OXIDATION
PALLADIUM
PHOTOELECTRON SPECTROSCOPY
PLATINUM METALS
SPECTROSCOPY
TRANSITION ELEMENTS