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

G. Kutluk, H. Ishijima, M. Kanno, T. Nagata, Andrew Domondon

研究成果: Article

6 引用 (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.

元の言語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
発行部数2-3
DOI
出版物ステータスPublished - 2009 2
外部発表Yes

Fingerprint

Lanthanoid Series Elements
Photoionization
Rare earth elements
photoionization
Atoms
autoionization
atoms
Electrons
electrons
Gadolinium
cross sections
curve fitting
Curve fitting
Photoelectron spectroscopy
gadolinium
Wave functions
profiles
configurations
Synchrotron radiation
synchrotron radiation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Radiation

これを引用

A systematic study of photoionization of free lanthanide atoms in the 4d giant resonance region. / Kutluk, G.; Ishijima, H.; Kanno, M.; Nagata, T.; Domondon, Andrew.

:: Journal of Electron Spectroscopy and Related Phenomena, 巻 169, 番号 2-3, 02.2009, p. 67-79.

研究成果: Article

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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(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.",
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author = "G. Kutluk and H. Ishijima and M. Kanno and T. Nagata and Andrew Domondon",
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T1 - A systematic study of photoionization of free lanthanide atoms in the 4d giant resonance region

AU - Kutluk, G.

AU - Ishijima, H.

AU - Kanno, M.

AU - Nagata, T.

AU - Domondon, Andrew

PY - 2009/2

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N2 - 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.

AB - 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.

KW - Autoionization

KW - Cross-section

KW - Giant resonance

KW - Lanthanide atom

KW - Photoelectron

KW - Photoionization

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