The absorption spectra of single crystals of MnI 2 in the region 10000 to 30000 cm −1 are reported. At low temperature, 5 K, several of the observed absorption bands show well‐resolved vibronic fine structure. The absorption bands are assigned to electronic transitions of the d electrons of the manganese ion. From the spectra the values of the ligand field splitting 10 Dq = 6400 cm −1 and the Racah parameters B = 640 cm −1 , C = 3136 cm −1 are calculated. The results are compared with data for MnCl 2 and MnBr 2 , and are discussed in terms of the covalency in the manganese halides.
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erk et al. (1975) studied this question.
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