Valence-band photoemission in UO/sub 2/(111) near the 5d resonant photon energy

Journal Article · Wed Apr 15 04:00:00 EDT 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.5761· OSTI ID:6872036

Cox, L E; Ellis, W P; Cowan, R D; Allen, J W; Oh, S h; Lindau, I; Pate, B B; Arko, A J

Pronounced Fano-like resonant effects are observed in the photoemission spectra of the localized U 5f and OXp ndash: UXf,6d: bonding bands of UO/sub 2/ when photon energies near the U 5d/sub 3/2,5/2/ thresholds (105 and 97.1 eV, respectively) are employed. The constant-final-state spectra are well described by calculated transition energies and oscillator strengths for the 5d/sup 10/5f/sup 2/..-->../sup h//sup ..nu../5d/sup 9/5f/sup 3/ process; also, the decay rates of the intermediate-state multiplets are in qualitative agreement with the observed width of the spectral features. Distinctly different constant-initial-state (CIS) spectra are obtained at the intensity maximum of the U 5f photopeak and at the minimum between the 5f peak and the O 2p bonding band. Calculated decay rates indicate that this results from variations in the branching ratio for decay of intense intermediate-state multiplets into /sup 2/F/sub 5/2/ and /sup 2/F/sub 7/2/ final states. Resonant effects in the OXp ndash: UXf,6d: bonding band show the bonding participation of U orbitals; moreover, the higher intensity of the CIS spectrum obtained near the top of the bonding band agrees with band-structure calculations showing most of the U 5f character in this region.

• Research Organization: Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 6872036
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:11; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTINIDE COMPOUNDS
BAND THEORY
BRANCHING RATIO
BREMSSTRAHLUNG
CHALCOGENIDES
CRYSTALS
D STATES
DATA
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ENERGY LEVELS
EXPERIMENTAL DATA
INFORMATION
MONOCRYSTALS
MULTIPLETS
NUMERICAL DATA
OSCILLATOR STRENGTHS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
RESONANCE
SPECTROSCOPY
SYNCHROTRON RADIATION
URANIUM COMPOUNDS
URANIUM OXIDES