Relativistic atomic data for EUV and X-ray lines in the highly charged Zn-like ions from Yb40+ to U62+

Quinet, Pascal; Biémont, Émile; Palmeri, P.

doi:10.1016/j.adt.2007.05.001

Cited by 22 publications

(30 citation statements)

References 28 publications

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“…For example, two (relativistic) multi-configuration Dirac-Fock (MCDF) calculations by Biémont claim a coverage from Rb VIII (Z = 37) to Xe XXV (Z = 54) or W XLV (Z = 74) in the abstract [80,81], but in both cases, the listed results actually begin at Z = 47 (Ag). A later MCDF computation by Quinet et al [82] begins at Z = 70 (and extends to uranium (Z = 92); it thus complements the earlier work. It is very laudable that the calculations (performed by members of the same team) do overlap, indicating how different (but related) atomic structure packages yield somewhat different results.…”

Section: Zn-like Ionssupporting

confidence: 61%

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Intercombination Transitions in the n = 4 Shell of Zn-, Ga-, and Ge-Like Ions of Elements Kr through Xe

Santana

Quinet

Palmeri

2018

Atoms

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Earlier beam-foil measurements have targeted 4s-4p intercombination transitions in the Zn-, Ga- and Ge-like ions of Nb (Z=41), Mo (Z=42), Rh (Z=44), Ag (Z=47) and I (Z=53). At the time, the spectra were calibrated with literature data on prominent lines in the Cu- and Zn-like ions. Corresponding literature data on the intercombination transitions in Ga- and Ge-like ions were largely lacking, which caused some ambiguity in the line identifications. We review the (mostly computational) progress made since. We find that a consistent set of state-of-the-art computations of Ga- and Ge-like ions would be highly desirable for revisiting the beam-foil data and the former line identifications for the elements from Kr (Z=36) to Xe (Z=54). We demonstrate that the literature data for these two isoelectronic sequences are insufficient, and we contribute reference computations in the process. We discuss the option of electron beam ion trap measurements as an alternative to the earlier use of classical light sources, beam-foil interaction and laser-produced plasmas, with the example of Xe (Z=54).

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Section: Zn-like Ionssupporting

confidence: 61%

“…(c) (Bottom panel) Only the computations with the smallest deviation from experiment are shown. Key to computations: Curtis [77], Biémont et al [80,81], Cheng and Huang [89], Vilkas and Ishikawa [84], Liu et al [83], Quinet et al [82], Blundell [85], Safronova et al [87], Santana [13].…”

Section: Figurementioning

confidence: 99%

Intercombination Transitions in the n = 4 Shell of Zn-, Ga-, and Ge-Like Ions of Elements Kr through Xe

Santana

Quinet

Palmeri

2018

Atoms

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“…Then, one may anticipate that if the incorrect prediction of the 3C/3D line intensity ratio relates to electron correlation effects, the agreement between theory and experiment will vary with Z, and the deviation will vanish for large Z. Such a trend of the deviation of theoretical (e.g., MCDF) and experimental data as function of Z is commonly observed for transition energies in isoelectronic sequences [3,[33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 96%

Electron-correlation effects on the3Cto3Dline-intensity ratio in the Ne-like ionsAr8+
Santana
¹
,
Lepson
²
,
Beiersdörfer
³

2015
Phys. Rev. A
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We present a theoretical and experimental investigation of the 3d → 2p resonance to intercombination line ratio in low-to mid-Z neonlike ions of astrophysical interest, i.e., of the 2p 1/2 2p 4 3/2 3d 3/2 1 P o 1 → 2p 6 1 S 0 and 2p 2 1/2 2p 3 3/2 3d 5/2 3 D o 1 → 2p 6 1 S 0 transitions commonly labeled 3C and 3D, respectively. In particular, we have employed the configuration interaction method with three different numbers of basis states and the many-body perturbation theory method to calculate oscillator strengths and energies for neonlike ions from Z = 18 to Z = 36. Combining our calculations with a systematic study of previous works in the literature, we show that these methods can predict accurate and converged energies for these transitions. We also find convergence for the oscillator strengths, but the ratio of oscillator strengths, which can be compared to experimental values of the relative intensity ratios of these lines, appears to converge to values higher than measured. We speculate that this is due to the role of electron-electron correlations. While the amount of electron correlations associated with the intercombination line 3D appears to be well described, it seems that the contributions from highly excited states are not sufficiently accounted for in the case of the resonance line 3C. In order to augment the body of available experimental data for neonlike ions, we present a measurement of the 3C and 3D lines in neonlike Ar 8+. We report a wavelength of 41.480 ± 0.001Å for line 3C and 42.005 ± 0.001Å for line 3D. The intensity ratio of the two lines was determined to be I(3C)/I(3D) = 11.32 ± 1.40.

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“…The multiconfiguration Dirac-Fock (MCDF) model was used. Results were reported for the 4s 2 -4s4p, 4s4p-4p 2 and 4s4p-4s4d transitions [9].…”

Section: Introductionmentioning

confidence: 99%

Relativistic many-body calculations of the oscillator strengths, transition rates and polarizabilities in Zn-like ions

Safronova

2010

J. Phys. B: At. Mol. Opt. Phys.

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Transition rates, oscillator strengths and line strengths are calculated for electric-dipole (E1) transitions between even-parity 4s 2 , 4p 2 , 4s4d, 4d 2 , 4p4f and 4f 2 states and odd-parity 4s4p, 4s4f, 4p4d and 4d4f states in Zn-like ions with the nuclear charges ranging from Z = 32 to 100. Relativistic many-body perturbation theory (RMBPT), including the Breit interaction, is used to evaluate retarded E1 matrix elements in length and velocity forms. The calculations start from a 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 Dirac-Fock potential. First-order RMBPT is used to obtain intermediate coupling coefficients and second-order RMBPT is used to calculate transition matrix elements. Contributions from negative-energy states are included in the second-order E1 matrix elements to ensure the gauge independence of transition amplitudes. Transition energies used in the calculation of oscillator strengths and transition rates are from second-order RMBPT. Ground state scalar α 0 (4s 2 1 S 0) polarizabilities are calculated for Zn-like ions from Z = 33 to 100. To evaluate the α 0 (4s 2 1 S 0) polarizabilities, we calculate RMBPT energies for the odd-parity 4l5l complex with J = 1 and line strengths between the even-parity 4l4l complex with J = 0 and the odd-parity 4l5l , 4l6l complexes with J = 1.

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Relativistic atomic data for EUV and X-ray lines in the highly charged Zn-like ions from Yb40+ to U62+

Cited by 22 publications

References 28 publications

Intercombination Transitions in the n = 4 Shell of Zn-, Ga-, and Ge-Like Ions of Elements Kr through Xe

Intercombination Transitions in the n = 4 Shell of Zn-, Ga-, and Ge-Like Ions of Elements Kr through Xe

Electron-correlation effects on the3Cto3Dline-intensity ratio in the Ne-like ionsAr8+
Santana
¹
,
Lepson
²
,
Beiersdörfer
³

2015
Phys. Rev. A
Self Cite
30
5
21
0
View full text Add to dashboard Cite

Relativistic many-body calculations of the oscillator strengths, transition rates and polarizabilities in Zn-like ions

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Relativistic atomic data for EUV and X-ray lines in the highly charged Zn-like ions from Yb40+ to U62+

Cited by 22 publications

References 28 publications

Intercombination Transitions in the n = 4 Shell of Zn-, Ga-, and Ge-Like Ions of Elements Kr through Xe

Intercombination Transitions in the n = 4 Shell of Zn-, Ga-, and Ge-Like Ions of Elements Kr through Xe

Electron-correlation effects on the3Cto3Dline-intensity ratio in the Ne-like ionsAr8+Santana1, Lepson2, Beiersdörfer3 2015Phys. Rev. ASelf Cite305210View full textAdd to dashboardCite

Relativistic many-body calculations of the oscillator strengths, transition rates and polarizabilities in Zn-like ions

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Resources

About

Electron-correlation effects on the3Cto3Dline-intensity ratio in the Ne-like ionsAr8+
Santana
¹
,
Lepson
²
,
Beiersdörfer
³

2015
Phys. Rev. A
Self Cite
30
5
21
0
View full text Add to dashboard Cite