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4d-shell photoionization of Xe, Cs, Ba, Sm, Eu and Yb atoms studied by photoion-yield spectra, T Nagata, M Yoshino, T Hayaishi, Y Itikawa, Y Itoh, T Koizumi, T Matsuo, Y Sato, E Shigemasa, Y Takizawa, A Yagishita
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Nagata et al. (1990) studied this question.
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