The optical absorption spectra of trivalent holmium in single crystals of HoPO4 and (Y, Ho)PO4 have been measured in the range from 15000 to 29000 cm−1 including the Zeeman effect of the ground level 5I′8 and the two excited levels 3K′8 and 5G′5 at 85 and 4.2 °K. The splitting factors of the degenerate components of the ground level and the level 3K′8 indicate a small mixing of the states ΨγJ M with different M. With this fact some special features of the transitions between these two levels can be explained qualitatively.
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Becker et al. (1969) studied this question.
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