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- W2047591048 abstract "Abstract Charge-separated photoion-yield spectroscopy using monochromatized synchrotron radiation was conducted on free Ce, Nd, Gd, Dy, and Er lanthanide atoms in the 4d giant resonance region to measure the relative partial cross-section curves σ (M n + ) for the formation of M n + ( n = 1–4) ions. In addition, photoelectron spectroscopy was conducted on free Nd, Dy, and Er atoms to measure the cross-sections σ ( nl ) for photoionization of the nl (=4d, 5s, 5p and 4f) subshell electron. Drawing upon the obtained spectra and the results of previous photoion-yield studies on Xe, Cs, Ba, Sm, Eu, and Yb atoms, we discuss the character of photoionization processes in the 4d region. The obtained charge-state distribution shows that as the atomic number Z increases, the 4d giant resonance changes gradually, rather than suddenly, from a shape resonance to an autoionization resonance. One possible explanation for this change is that it is due to the dependence of the potential for the excited 4f electron and the corresponding 4f radial wavefunction on terms in the 4d 9 4f n +1 configuration. For σ (M + ) and σ (4f), which exhibit an asymmetric Beutler–Fano autoionization profile, a curve fitting analysis was conducted to obtain the profile parameters E r , Γ , and q . It was found that for the Gadolinium atom, which has a configuration [Xe]4f 7 5d6s 2 characterized by a half-filled 4f 7 subshell plus a 5d electron, both the asymmetry parameter q and the charge-state distribution varied peculiarly with the atomic number Z ." @default.
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- W2047591048 date "2009-02-01" @default.
- W2047591048 modified "2023-09-25" @default.
- W2047591048 title "A systematic study of photoionization of free lanthanide atoms in the 4d giant resonance region" @default.
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- W2047591048 doi "https://doi.org/10.1016/j.elspec.2008.11.004" @default.
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