Abstract
VERY dilute aqueous solutions of terbium salts exhibit a bright luminescence when excited by the ultra-violet rays1. The maximal excitation is caused by the absorption of the wave-lengths coinciding with the broad absorption band of terbium, stretching from 290 m far towards the short wave-lengths2. The spectrum of this luminescence consists of 7 bands, each band being nearly 100 A. wide. The wavelengths and frequencies of the middles of the bands are given in the accompanying table.
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References
Filippow, A., Larionow, J., and Seidel, A., C.R. Acad. Sci. U.S.S.R., (10) 1, 253 (1936).
Prandtl, W., und Schemer, K., Z. anorg. und allg. Chem., 220, 107 (1934).
Vleck, J. H. van, ” Theory of Electric and Magnetic Susceptibilities”, p. 246 (Oxford, 1936).
Ellis, S. B., Phys. Rev., 49, 876 (1936).
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SEIDEL, A. Luminescence of Solutions of Terbium Salts. Nature 139, 248–249 (1937). https://doi.org/10.1038/139248b0
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DOI: https://doi.org/10.1038/139248b0
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