Surface electronic structure and off-site Auger transitions on TaC(111) observed with Auger-photoelectron coincidence spectroscopy

Journal Article · Mon Apr 06 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.2247· OSTI ID:7048199

Bartynski, R A; Yang, S ^[1]; Hulbert, S L; Kao, C ^[2]; Weinert, M ^[3]; Zehner, D M ^[4]

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1. Department of Physics and Astronomy, Rutgers University, P.O. Box 849, Piscataway, New Jersey 08855-0849 (United States)
2. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)
3. Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)
4. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6057 (United States)

The Ta {ital N}{sub 7}-{ital VV} Auger spectrum of TaC(111) has been measured in coincidence with photoemission from the bulk and surface shifted Ta 4{ital f}{sub 7/2} core levels. Good agreement is found between the surface Auger spectrum and a self-convolution of the density of states (SCDOS) at surface Ta sites determined by a first-principles calculation. The bulk spectrum disagrees with the bulk SCDOS but is well described by an incoherent sum of the bulk SCDOS and the surface spectrum. A novel off-site Auger decay mechanism, first observed on Ta(100), accounts for these observations.

• DOE Contract Number: AC02-76CH00016; AC05-84OR21400
• OSTI ID: 7048199
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 68:14; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
AUGER EFFECT
BINDING ENERGY
CARBIDES
CARBON COMPOUNDS
COINCIDENCE METHODS
COUNTING TECHNIQUES
DATA
ELECTRONIC STRUCTURE
ELEMENTS
EMISSION
ENERGY
ENERGY-LEVEL DENSITY
EXPERIMENTAL DATA
INFORMATION
METALS
NUMERICAL DATA
PHOTOEMISSION
REFRACTORY METAL COMPOUNDS
SECONDARY EMISSION
SURFACE PROPERTIES
TANTALUM
TANTALUM CARBIDES
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS