Bulk and surface electronic structure of Li{sub 2}O
- Department of Applied Physics, Yale University, New Haven, Connecticut 06520 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- ASGAL Company Ltd., Yokota 523-2, Sambu-machi, Chiba, 289-12 (Japan)
We have used photoemission and electron-energy-loss spectroscopies to determine the surface and bulk electronic structure of a single-crystal sample of the alkali-metal oxide Li{sub 2}O. The predominately O 2{ital p} valence band exhibits two main features in the photoemission spectrum, whose relative widths are consistent with results of an {ital ab} {ital initio} Hartree-Fock calculation of the bulk electronic structure. However, changes in the intensity of the two features as a function of the exciting photon energy are large and not understood. Energy-loss spectra show the presence of a strong surface exciton in the bulk band gap of Li{sub 2}O; such excitonic surface states do not exist for the alkali halides. Its energy is about 2 eV less than the bulk band gap, similar to the surface excitonic shifts that have been observed in the alkaline-earth oxides. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 286371
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 54, Issue 3; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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