Abstract
IN recent papers, Kramers, Bethe and Van Vleck1 have discussed theoretically the possibility of a weak Stark splitting of the 6S levels of Mn++ and Fe+++ ions in crystalline fields. As Van Vleck has shown, such a splitting would lead to two important consequences in the magnetic behaviour of these ions in crystals: (1) it would produce a feeble magnetic anisotropy in the crystal; (2) the temperature dependence of the three principal susceptibilities of the crystal would not exactly conform to the simple Curie law. The first effect, namely, the magnetic anisotropy, can be measured accurately, and can indeed be used, as Van Vleck has pointed out, as a means of calculating indirectly the magnitude of the Stark separation.
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References
Phil. Mag., 17, 961; 1934.
Phil. Trans., A, 232, 99; 1933.
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KRISHNAN, K., BANERJEE, S. Stark Splitting of the 6S Level of the Manganous Ion in Crystalline Fields. Nature 135, 873 (1935). https://doi.org/10.1038/135873b0
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DOI: https://doi.org/10.1038/135873b0
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