The Zeeman effect has been observed in the optical spectra of Yb³⁺ ions in different sites in CaF₂. All but one of the correlations between ESR and optical spectra, reported by Kirton and McLaughlan, have been checked and confirmed, and the upper-state g values have been determined. Ambiguity in the interpretation of the rhombic spectra has been eliminated, and we have shown with 90% confidence that the upper-state splitting of Yb³⁺ in cubic sites is greater than 18.3 cm^-1.
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Kirton et al. (1969) studied this question.
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