Abstract
INVESTIGATING the connexion between the emission spectra in colourless materials1 and the absorption spectra of the ions of the rare earths2 we have found that the pure salts of the rare earths can also exhibit a fluorescence of a surprising brightness. Up to the present, this fact was still very doubtful3. Under excitation with violet and ultra-violet light, europium sulphate in particular shows a brilliant red fluorescence. Terbium sulphate fluoresces also very strongly with a pale greenish colour. The luminosity of the sulphates of samarium and dysprosium is weaker. Our samples of the sulphates of holmium and erbium showed no perceptible emission. The spectra emitted are very sharp, especially at lower temperatures.
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