Abstract
THE experiments of J. Becquerel and W. J. de Haas1 on the paramagnetic rotation of the plane of polarisation of light in a crystal of tysonite (which is a fluoride of cerium and lanthanum) has created an interest in the absorption spectra due to the Ce+++ ion. These authors, as a result of their measurements at low temperatures, and on the assumption that the dispersion produced in tysonite is due to the presence of a single absorption band, came to the conclusions that (i.) the rotation phenomena are due to the presence of the Ce+++ ion, and (ii.) the position of the absorption band is somewhere in the region of 2370 A.
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References
Zeit. fur Phys., 57, p. 11; 1929.
Phys. Rev., 33, p. 157; 1929.
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BOSE, D., DATTA, S. Absorption Spectra of the Ce+++ Ion in Solution. Nature 128, 270–271 (1931). https://doi.org/10.1038/128270b0
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DOI: https://doi.org/10.1038/128270b0
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