Spectrum of Er3+ in Single Crystals of Y2O3

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Abstract
The spectrum of Er3+ in single crystals of Y2O3 has been examined from 0.225 to 2.4 μ in absorption and fluorescence, and energy levels have been assigned. The Slater integrals and spin—orbit coupling parameter have been determined, which give the best over‐all agreement between the centers of gravity of the observed groups of levels and the 4f11 SLJ energy levels of the ``free'' Er3+ ion; they are F2=429.583 cm—1, F4=65.012 cm—1, F6=7.136 cm—1, ζ=—2383.17 cm—1. Of the two inequivalent cation sites, C2 and C3i, one can with consistency demonstrate that the site without inversion symmetry (C2) gives rise to the entire observed spectrum.

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