Electronic Structure of Lanthanum Calcium Oxoborate LaCa{sub 4}O(BO{sub 3}){sub 3}
Lanthanum calcium oxoborate (LaCOB) is a nonlinear optical material that belongs to the calcium-rare-earth (R) oxoborate family, with general composition CaRO(BO{sub 3}){sub 3} (R{sup 3+} = Sm, Gd, Lu, Y). X-ray photoemission, photoabsorption and resonant fluorescence were applied to study the electronic structure and surface chemistry of this material. High resolution photoemission measurements on the valence band electronic structure and La 3d and 4d, Ca 2p, B 1s and O 1s core lines were used to evaluate the surface and near surface chemistry. Element specific density of unoccupied electronic states in LaCOB were probed by x-ray absorption spectroscopy (XAS) at the La 3d (M4,5-edge), La 4d (N4,5-edge), B 1s and O 1s (K-edges) absorption edges. Soft x-ray fluorescence was used to further examine valence band states associated with spectral differences noted in the absorption measurements. These results provide the first measurements of the electronic structure and surface chemistry of this rare-earth oxoborate.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15007736
- Report Number(s):
- UCRL-JC-152151; TRN: US200421%%61
- Resource Relation:
- Conference: 9th International Conference on Electronic Spectroscopy and Structure, Uppsala (SE), 06/30/2003--07/04/2003; Other Information: PBD: 26 Jun 2003
- Country of Publication:
- United States
- Language:
- English
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