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Excitation and decay of the 4d^-1(4,{ε})f giant resonances of atomic Sm, Eu, and Gd have been investigated by photoabsorption and photoelectron spectroscopy. The experimental total and partial cross sections are compared to those predicted by many-electron theories. Autoionization into the 4f^-1{ε}l continuum dominates. The character of the giant resonances is closer to that of a 4d^-14f resonance than to that of a 4d^-1{ε}f shape resonance encountered for Ba and La.
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Richter et al. (1989) studied this question.
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