Occupied electronic states of CaSi{sub 2} and CaSi: Soft-x-ray-fluorescence spectroscopy
- Department of Physics, University of Tennessee, Knoxville, Tennessee 37996 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
- Department of Physics, Tulane University, New Orleans, Louisiana 70118 (United States)
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598 (United States)
- Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
The Ca {ital L}{sub 2,3} and Si {ital L}{sub 2,3} fluorescence spectra for CaSi{sub 2} and CaSi are studied. These spectra provide {ital s} and {ital d} partial density-of-states (PDOS) information for the Ca and Si atoms. The measured PDOS`s are in good agreement with available calculations. Using monochromatized x rays to excite core electrons to localized Ca {ital d} states near threshold produces resonant recombination fluorescence peaks for the {ital L}{sub 3} and {ital L}{sub 2} edges of Ca in both compounds. In CaSi, with resonant excitation, inelastic Raman peaks are also observed. The energy position of the inelastic peaks indicates that the creation of the core hole shifts the Ca {ital d} states by several eV. The intensity of the resonance peaks indicates the degree of localization of the Ca {ital d} states, which is reduced by their participation in the bonding of the silicides. The empty Ca {ital d} states are found to be quite localized in CaSi, and less so in CaSi{sub 2}.
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 90522
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 7 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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