Abstract
IT is well known that the absorption spectrum usually ascribed to didymium shows six bands in the blue and violet with approximate wave-lengths 482, 476, 469, 462, 444, 428, according to Lecoq de Boisbaudran.
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THOMPSON, C. Note on the Spectrum of Didymium 1 . Nature 36, 115 (1887). https://doi.org/10.1038/036115a0
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DOI: https://doi.org/10.1038/036115a0