A systematic study of photoionization of free lanthanide atoms in the 4d giant resonance region

G. Kutluk*, H. Ishijima, M. Kanno, T. Nagata, A. T. Domondon

*この研究の対応する著者

研究成果: Article査読

6 被引用数 (Scopus)

抄録

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(Mn+) for the formation of Mn+ (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 4d94fn+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 Er, Γ, and q. It was found that for the Gadolinium atom, which has a configuration [Xe]4f75d6s2 characterized by a half-filled 4f7 subshell plus a 5d electron, both the asymmetry parameter q and the charge-state distribution varied peculiarly with the atomic number Z.

本文言語English
ページ(範囲)67-79
ページ数13
ジャーナルJournal of Electron Spectroscopy and Related Phenomena
169
2-3
DOI
出版ステータスPublished - 2009 2月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 放射線
  • 原子分子物理学および光学
  • 凝縮系物理学
  • 分光学
  • 物理化学および理論化学

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