Structural determination of a palladium single crystal using photoelectron and Auger-electron angular distributions
- Zettlemoyer Center for Surface Studies, Lehigh University, Bethlehem, Pennsylvania 18015 (United States)
The angular distributions of Pd 3{ital d}{sub 5/2} ({ital E}{sub {ital k}}=1151.5 eV), Pd 3{ital d}{sub 3/2} ({ital E}{sub {ital k}}=1146.3 eV), and Pd 3{ital p}{sub 3/2} ({ital E}{sub {ital k}}=954.5 eV) photoelectrons and Pd {ital M}{sub 5}{ital VV} Auger electrons ({ital E}{sub {ital k}}=327.5 eV) were investigated for a single-crystal Pd(100) surface. We have observed pronounced anisotropies in both photoelectron and Auger-electron intensities as a function of the polar emission angle {theta} along the principal azimuthal directions {l angle}001{r angle} and {l angle}011{r angle}. We find that the observed angular distributions can be explained by the forward scattering of the outgoing electron waves (regardless of whether they are photoelectrons or Auger electrons) by the atoms overlying the emitter. Direct structural information was obtained by using the kinetic-energy dependence of the angular distributions of photoelectrons and Auger electrons in that zeroth-order forward-focused peaks are independent of energy, whereas the first-order interference intensities shift with energy. Forward-scattering spectroscopy is a very powerful technique in determining the relaxation of surface atoms despite a lack of translational symmetry normal to the surface. We have shown that the Pd(100) surface does not relax within 1.0{degree}. The experimentally observed angular distributions are consistent with a single-scattering model in which forward focusing dominates the photoelectron and Auger-electron angular distributions.
- DOE Contract Number:
- FG02-86ER13580
- OSTI ID:
- 7165844
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:8; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ANISOTROPY
AUGER EFFECT
CRYSTAL STRUCTURE
CRYSTALS
DATA
ELECTRON SPECTROSCOPY
ELEMENTS
EPITAXY
INFORMATION
METALS
MONOCRYSTALS
NUMERICAL DATA
PALLADIUM
PHOTOELECTRON SPECTROSCOPY
PLATINUM METALS
SPECTROSCOPY
SURFACE PROPERTIES
THEORETICAL DATA
TRANSITION ELEMENTS