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The T2g4 level of Cr3+ in K2NaCrF6 and in K2NaGaF6:Cr3+ is strongly mixed with the Eg2 and T2g2 levels by spin–orbit coupling in the six-coordinated cubic (Oh) site. The observed band profile for absorption and fluorescence in the transitions A2g4 ↔ 4T2g in the dilute system shows remarkably well-resolved vibrational band progressions which have been analyzed in terms of a totally symmetric vibration at 568 cm−1 (556 cm−1 for the excited state) and a large number of nontotally symmetric vibrations ranging from 25–961 cm−1.
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Ferguson et al. (1971) studied this question.
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