Abstract
PROF. F. RASETTI1 has described lines in the Raman spectrum of fluorite and calcite, which show a remarkably large shift of about 7000 cmâ1. Owing to the theoretical importance of this fact, which would indicate the co-operation of electronic transitions of considerable energy in the Raman spectra, I wish to point out that these lines can be explained as lines of the phosphorescence of gadolinium. It is a wellknown fact that natural fluorite nearly always contains rare earths. These earths, when excited by ultra-violet light or cathode rays, show a phosphorescence having a spectrum of very sharp lines. The spectrum of fluorite was examined by G. Urbain.2 The following table shows that the observed lines coincide with the lines of phosphorescence of gadolinium.
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References
NATURE, April 25, 1931, p. 626.
Ann. de chim., 1909, and "Handb. d. Experimentalphysik", 23, 484; 1928.
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TOMASCHEK, R. Lines of Large Frequency Shift in the Raman Spectra of Crystals. Nature 128, 495 (1931). https://doi.org/10.1038/128495a0
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DOI: https://doi.org/10.1038/128495a0
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