X-Ray Spectroscopic Studies of CaF_2, CaO and CaS
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概要
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The Kα emission and Kβ emission spectra in the fluorescence of Ca^<2+> in CaF_2, CaO and CaS are measured with a two-crystal vacuum spectrometer. Chemical shifts are observed for the Ca^<2+> Kα_<1,2>, Kβ_<1,3> and Kβ_5 emission peaks. The measured Kβ_5 emission bands are presented along with the ultraviolet photoelectron spectrum of the F^- 2p valence band of CaF_2, the X-ray photoelectron spectrum of the O^<2-> 2p valence band of CaO, the S^<2-> Kβ emission spectrum of CaS and the Ca^<2+> K absorption spectra of these compounds, reported previously. By using these spectra, the first small peak at the Ca^<2+> K absorption threshold of each compound is identified as being due to a core exciton, the energy level of which is formed below the bottom of the conduction band. The binding energies of the excitons are estimated to be 3.6 (±0.4), 2.5 (±0.5) and 0.6 (±0.5) eV for CaF_2, CaO and CaS, respectively.
- 社団法人応用物理学会の論文
- 1992-09-15
著者
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Sugiura Chikara
Department Of Applied Physics Faculty Of Engineering
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Sugiura Chikara
Department Of Electrical And Electronic Engineering Faculty Of Engineering
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