Alkali halide crystals and pressed disks doped with divalent europium were prepared and their absorption and fluorescence spectra measured. There are two broad absorption bands in the ultraviolet, peaking at ~250 and 330 mµ, both due to the transition 4ƒ⁷→ 4ƒ⁶5d¹, and attributed, after comparison with the absorption spectra of Eu²⁺ observed by previous workers in various other media, to the splitting of the 5d orbitals by the crystal field.

In addition to the many sharp bands riding on the main absorption bands, one peaking at 270 mµ has been observed, in complete analogy with the Gd³⁺ spectrum. The fluorescence emission spectra are identical, irrespective of the wavelength of irradiation (250 or 330 mµ).

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