Abstract
Strong absorption in the vacuum ultraviolet region near the exciton edge was observed in Cd doped CaF 2 , SrF 2 and BaF 2 crystals. The Cd + + absorption band at 8.6 eV was observed in low doped BaF 2 crystals. In SrF 2 and CaF 2 the maximum of Cd + + band cannot be resolved due to stronger overlapping with exciton bands. The calculations of geometry of Cd + + and Cd + centres and Cd- related electron transitions were done using ab - initio Hartree-Fock and density functional methods. The experimental and calculated results lead us to the conclusion that strong Cd + + absorption bands belong to allowed transitions from the nearest fluorides to the Cd + + ion. Lattice relaxation around Cd + centres, created by x-irradiation, and optical transitions of these centres were also calculated. The calculated energies are in good agreement with experimental ones.
Published Version
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