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The optical spectrum with Zeeman effect of Type I Er3+:CaF2 single crystal shows that the Er3+ ions are situated at trigonal, tetragonal, and cubic sites. The lines of the absorption spectrum are identified according to these site symmetries by means of Zeeman effect patterns. Some of their g values are reported. An analysis of the crystal field effect on the Er3+ ions at C3v site symmetry is given. The accuracy of the calculation of the crystal field parameters is discussed.
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A. F. Leung (1973) studied this question.
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