Observations of the 3d photoabsorption spectra of isoelectronic Eu 2+ and Gd 3+ are reported. Their theoretical positions and relative intensities based on the 3d 10 4f 7 to 3d 9 4f 8 transition array are given and found to be in good agreement with the experimentally observed principal features. The 3d photoabsorption of the trivalent Eu is discussed and compared with that of trivalent Yb.
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Bonnelle et al. (1977) studied this question.
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