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A comparative study of radiation damage caused by the irradiation of oxygen-free calcium fluoride single crystals with ∼GeV 132Xe or 209Bi heavy ions, 100-keV light hydrogen ions (protons) or X-rays at room temperature has been performed. Optical absorption in a wide spectral region from NIR to VUV (1.5–10.5 eV), its dependence on stepwise preheating of the irradiated CaF2 crystals to a certain temperature...
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