Abstract
BECQUEREL and de Haas,1 from their work on the magnetic rotation of the crystal tysonite, predicted that the Ce+++ ion possesses an intense paramagnetically active absorption band in the neighbourhood of λ 2370 A. This prediction was based on the assumptions that (1), although tysonite is a complex fluoride of Ce+++, Pr+++ and Nd+++, the only sensibly rotating ion is Ce+++; (2) the rotation due to Ce+++ is controlled by a single absorption frequency. It occurred to us that it would be of interest to test the validity of this predicted property of the Ce+++ ion, by investigating the magnetic rotation of solutions of cerous salts in the visible and near ultra-violet regions of the spectrum.
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References
Z. Phys., 57, 11; 1929.
Rev. d'Opt., 6, 163; 1927.
NATURE, 128, 270, Aug. 15, 1931.
Phys. Rev., 38, 2122; 1931.
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ROBERTS, R., WALLACE, L. Magnetic Rotatory Dispersion and Absorption of the Cerous Ion in Solution. Nature 130, 890–891 (1932). https://doi.org/10.1038/130890c0
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DOI: https://doi.org/10.1038/130890c0
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