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- W2035765400 abstract "Optical-absorption spectra of Ca${mathrm{F}}_{2}$: Co x-irradiated at 80 and 300 K are reported. Room-temperature x-irradiated crystals show five bands with peaks at 250, 295, 545, 715, and 780 nm which are associated with a Co-related defect. Irradiation at 80 K produces some bands at 240, 280, and 535 nm which are also associated with the presence of Co. Dichroism measurements show that the centers responsible for these bands, both in the 300-K and in the 80-K irradiated samples, have a trigonal symmetry. From dichroism and bleaching experiments a model consisting of an $F$ center nearest to a ${mathrm{Co}}^{2+}$ ion in a substitutional position is proposed for the defect created at 300 K. The same center, but perturbed by an interstitial, is proposed for the defect produced at 80 K. The energy levels of the room-temperature-produced center, together with the polarizations and energies of its possible electronic transitions, have been calculated using the Mulliken-Wolfsberg-Helmholtz approximation. A good agreement with the experimental results is obtained." @default.
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- W2035765400 date "1978-11-15" @default.
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- W2035765400 title "Optica absorption spectrum of x-irradiated Ca<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>F</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>:Co" @default.
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- W2035765400 doi "https://doi.org/10.1103/physrevb.18.5506" @default.
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