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• W2019753676 startingPage "6899" @default.
• W2019753676 abstract "The fine structure of the Ca 2p soft-x-ray-absorption edge is studied for a variety of bulk compounds (Ca metal, ${mathrm{CaSi}}_{2}$, CaO, and ${mathrm{CaF}}_{2}$), for surfaces and interfaces [${mathrm{CaF}}_{2}$(111), ${mathrm{BaF}}_{2}$ on ${mathrm{CaF}}_{2}$(111), Ca and ${mathrm{CaF}}_{2}$ on Si(111)], and for defects (F centers in ${mathrm{CaF}}_{2}$). The observed multiplet structure is explained by atomic calculations in a crystal field [cubic ${mathit{O}}_{mathit{h}}$ for the bulk and threefold ${mathit{C}}_{3mathit{v}}$ for the (111) surfaces and interfaces]. While the bulk spectra are isotropic, the surface and interface spectra exhibit a pronounced polarization dependence, which is borne out by the calculations. This effect can be used to become surface and/or interface selective via polarization-modulation experiments, even for buried interfaces. A change in valence from ${mathrm{Ca}}^{2+}$ to ${mathrm{Ca}}^{1+}$ causes a downwards energy shift and extra multiplet lines according to the calculation. The energy shift is observed for F centers at the ${mathrm{CaF}}_{2}$ surface and for the ${mathrm{CaF}}_{2}$/Si(111) interface." @default.
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• W2019753676 date "1991-03-15" @default.
• W2019753676 modified "2023-09-24" @default.
• W2019753676 title "Fine structure of the Ca 2<i>p</i>x-ray-absorption edge for bulk compounds, surfaces, and interfaces" @default.
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• W2019753676 doi "https://doi.org/10.1103/physrevb.43.6899" @default.
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