The authors show that CaF2:Y crystals that have been X-irradiated at low temperatures contain Y2+ ions associated with a trigonally located interstitial F- ion. Experimental results are presented that support this identification and that show that a trigonal Jahn-Teller effect (with warping) is involved. An estimate for the Jahn-Teller energy of EJT approximately=490 cm-1 is obtained.
  • EPR investigation of the 4d1 ion Y2+ in CaF2 crystals
    C. Balestra and H. Bill
    in "Proc. XVIIIth Colloque Ampère" Notthingham, 18 (1974), p155-156

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