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Luminescence of Al 2 O 3 single crystals doped with Cr 3+ (∼500ppm) (ruby), non-irradiated and irradiated by 50-MeV electrons, has been studied in a wide range of excitation energy (3.75–20eV) at 9K and compared with the luminescence of irradiated undoped Al 2 O 3 . Irradiation of ruby by 50-Mev electrons (up to fluences of 2×10 17 e/cm 2 ) does...
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