Fluorescence of ${Dy}^{3 +}$ in Ca $F_{2}$

The fluorescent "Spectra I" of

{Dy}^{3 +}

in Ca

F_{2}

consisting of approximately 45 lines are found to originate from the crystal-field split levels of the

{}^{4}F_{\frac{11}{2}}

and

{}^{6}H_{\frac{15}{2}}

{}^{6}H_{\frac{13}{2}}

and

{}^{6}H_{\frac{11}{2}}

free-ion states, in accord with energy-level schemes which indicate the crystal-field symmetry for Spectra I about the Dy ion to be type

O_{h}

group. These schemes also give information on the crystal-field energy level representations and energies to 3

{cm}^{- 1}

, preliminarily.

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Fluorescence ofDy3+in CaF2