Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>15</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>dielectronic recombination and the effects of configuration interaction between resonances with different captured electron principal quantum numbers

Kwon, Duck-Hee; Savin, D. W.

doi:10.1103/physreva.83.012701

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…We have verified the convergence of our calculations by increasing the partial wave expansion up to l max = 50 and find that the results do not change. We have also checked for the effects of configuration interaction (CI) between different 2l 7 3s 2 3p 3 nl configurations for n = 3-10 using the same approach as we did for our CI studies of dielectronic recombination for Fe 15+ [26]. However, we find that the CI does not change our results.…”

Section: Resultsmentioning

confidence: 96%

Theoretical electron-impact-ionization cross section for Fe11+forming Fe12+

Kwon

Savin

2012

Phys. Rev. A

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We have calculated cross sections for electron impact ionization (EII) of P-like Fe 11+ forming Si-like Fe 12+ . We have used the flexible atomic code (FAC) and a distorted-wave (DW) approximation. Particular attention has been paid to the ionization through the 3l → nl and 2l → nl excitation autoionization (EA) channels. We compare our results to previously published FAC DW results and recent experimental results. We find that the previous discrepancy between theory and experiment at the EII threshold can be accounted for by the 3l → nl EA channels which were not included in the earlier calculations. At higher energies the discrepancy previously seen between theory and experiment for the magnitude of the 2l → nl (n 4) EA remains, though the difference has been reduced by our newer results. The resulting Maxwellian rate coefficient derived from our calculations lies within 11% of the experimentally derived rate coefficient in the temperature range where Fe 11+ forms in collisional ionization equilibrium.

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Section: Resultsmentioning

confidence: 96%

Theoretical electron-impact-ionization cross section for Fe11+forming Fe12+

Kwon

Savin

2012

Phys. Rev. A

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“…These channels were included here and are available for n 5 for Ca 9+ , n 6 for Ti 11+ and Cr 13+ , and n 7 for Fe 15+ , Ni 17+ , and Zn 19+ . As shown in Kwon & Savin (2011), multi-n CI results in the opening up of additional autoionization and radiative decay channels.…”

Section: Calculational Methodsmentioning

confidence: 96%

“…The resulting rate coefficient is about 13% smaller at CIE temperatures than our fully single-n CI results. This is due to the reduction in resonance strengths as detailed in Kwon & Savin (2011). Figure 2 shows the total rate coefficients for Ca 9+ , Ti 11+ , Cr 13+ , Fe 15+ , Ni 17+ , and Zn 19+ .…”

Section: Calculational Methodsmentioning

confidence: 96%

“…We have used the flexible atomic code (FAC) of Gu (2008) to calculate the required atomic parameters as detailed in Kwon & Savin (2011). Here we briefly review those calculations as applied here to generate rate coefficients.…”

Section: Calculational Methodsmentioning

confidence: 99%

“…Recently, in Kwon & Savin (2011), we have investigated the cause for the discrepancy between theory and experiment for the simple M-shell ion Na-like Fe 15+ forming Mg-like Fe 14+ via Δn c = 1 core excitation of a 2l electron. We demonstrated in that work the importance of configuration interaction (CI) between resonances with different captured electron principal quantum numbers n and found that this multi-n CI can lead to significant reduction in DR resonance strength for resonances where n 5.…”

Section: Introductionmentioning

confidence: 99%

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EFFECTS OF CONFIGURATION INTERACTION FOR DIELECTRONIC RECOMBINATION OF Na-LIKE IONS FORMING Mg-LIKE IONS

Kwon

Savin

2011

ApJ

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Theoretical dielectronic recombination (DR) rate coefficient calculations can be sensitive to configuration interaction (CI) between resonances with different captured electron principle quantum numbers n. Here we explore the importance of this multi-n CI process for DR via 2l → 3l core excitations and its effect on the total DR rate coefficient. Results are presented for selected Na-like ions from Ca 9+ to Zn 19+. We find that including this multi-n CI can reduce the DR rate coefficient by up to ∼10% at temperatures where an ion is predicted to form in collisional ionization equilibrium and up to ∼15% at higher temperatures. To a first approximation, this will translate into a corresponding increase in the ion abundance. Charge state distributions calculation seeking to be accurate to better than 10% will thus need to take this effect into account. We also present simple fits to the calculated rate coefficients for ease of incorporation into plasma models.

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Research on atomic structure and collision cross-sections for spectroscopic modeling in KAERI Atomic Data Center

Kwon

Chai

2023

J. Korean Phys. Soc.

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Fe15+dielectronic recombination and the effects of configuration interaction between resonances with different captured electron principal quantum numbers

Cited by 6 publications

References 13 publications

Theoretical electron-impact-ionization cross section for Fe11+forming Fe12+

Theoretical electron-impact-ionization cross section for Fe11+forming Fe12+

EFFECTS OF CONFIGURATION INTERACTION FOR DIELECTRONIC RECOMBINATION OF Na-LIKE IONS FORMING Mg-LIKE IONS

Research on atomic structure and collision cross-sections for spectroscopic modeling in KAERI Atomic Data Center

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