Energy Levels of Trivalent Europium in Yttrium Gallium Garnet

Experimental and theoretical studies of the Eu3+ spectrum in yttrium gallium garnet are reported in the present article. From the crystal-field calculations on the split 7F manifolds it is concluded that the crystal field deviates from tetragonal symmetry. A reasonable agreement has been obtained between the calculated and observed splitting patterns of these manifolds. The best evaluation of the crystal-field parameters yields: A20=+105 cm−1, A22=±95 cm−1, A40=−170 cm−1, A42=∓100 cm−1, A44=850 cm−1, A60=50 cm−1, A62=±150 cm−1, and A64=+945 cm−1 where Anm=〈rn〉Bnm.

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