The dielectric function of CaF2 between 10 and 35 eV

Barth, J.; Johnson, R. L.; Cardona, M.; Fuchs, Dietmar; Bradshaw, Alexander M.

doi:10.1103/PhysRevB.41.3291

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The dielectric function of CaF₂ between 10 and 35 eV

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Fuchs, Dietmar
Fritz Haber Institute, Max Planck Society;

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Bradshaw, Alexander M.
Fritz Haber Institute, Max Planck Society;

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Citation

Barth, J., Johnson, R. L., Cardona, M., Fuchs, D., & Bradshaw, A. M. (1990). The dielectric function of CaF₂ between 10 and 35 eV. Physical Review B, 41(5), 3291-3294. doi:10.1103/PhysRevB.41.3291.

Cite as: https://hdl.handle.net/21.11116/0000-0006-A762-F

Abstract

The dielectric function of CaF₂ over the photon energy region 10–35 eV has been determined by spectroscopic ellipsometry. Close to the fundamental absorption edge the data agree fairly well with band-structure calculations. A sharp exciton at the Ca 3p threshold (27.9 eV) is immediately followed by structures which can be attributed to variations in the conduction-band density of states. The strong transitions observed at higher energies cannot be explained in the one-electron band-structure model. Detailed theoretical calculations are required.