Correlation and relaxation effects in ns<sup>2</sup>-nsnp transitions

Bruneau, J.

doi:10.1088/0022-3700/17/15/015

Cited by 69 publications

(42 citation statements)

References 31 publications

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“…The autoionization rate can be calculated as a configuration average [88,89]. We developed such an approach in the Multi-Configuration Dirac-Fock (MCDF) code developed by Bruneau [90,91], and our results are very close to the ones obtained with the Flexible Atomic Code (FAC) [92] (see Table 5). …”

Section: Autoionizationsupporting

confidence: 60%

“…However, there is a large discrepancy between observations and theory. Table 6 contains the values of the oscillator strengths of 3C and 3D lines calculated with our MCDF code [90,91] in the "transition state" approximation within two different gauges: Coulomb (velocity) and Babushkin (length) [94,95]. The self-consistent-field MCDF equations are obtained by requiring that a particular functional is stationary with respect to radial wavefunctions.…”

Section: Breit Interaction and Qed Correctionsmentioning

confidence: 99%

“…Table 6. Values of the oscillator strengths of 3C and 3D lines calculated with our MCDF code [90,91] in the "transition state" approximation. The value of the ratio r is not very sentitive to the choice of the gauge [94,95] More generally, the emission arising from He-like iron lines and their dielectronic satellites was observed at low resolution in a number of clusters of galaxies.…”

Section: Breit Interaction and Qed Correctionsmentioning

confidence: 99%

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Detailed Opacity Calculations for Astrophysical Applications

Pain

Gilleron

Comet

2017

Atoms

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Nowadays, several opacity codes are able to provide data for stellar structure models, but the computed opacities may show significant differences. In this work, we present state-of-the-art precise spectral opacity calculations, illustrated by stellar applications. The essential role of laboratory experiments to check the quality of the computed data is underlined. We review some X-ray and XUV laser and Z-pinch photo-absorption measurements as well as X-ray emission spectroscopy experiments involving hot dense plasmas produced by ultra-high-intensity laser irradiation. The measured spectra are systematically compared with the fine-structure opacity code SCO-RCG. The focus is on iron, due to its crucial role in understanding asteroseismic observations of β Cephei-type and Slowly Pulsating B stars, as well as of the Sun. For instance, in β Cephei-type stars, the iron-group opacity peak excites acoustic modes through the "kappa-mechanism". Particular attention is paid to the higher-than-predicted iron opacity measured at the Sandia Z-machine at solar interior conditions. We discuss some theoretical aspects such as density effects, photo-ionization, autoionization or the "filling-the-gap" effect of highly excited states.

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Section: Autoionizationsupporting

confidence: 60%

Section: Breit Interaction and Qed Correctionsmentioning

confidence: 99%

Section: Breit Interaction and Qed Correctionsmentioning

confidence: 99%

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Detailed Opacity Calculations for Astrophysical Applications

Pain

Gilleron

Comet

2017

Atoms

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“…In the case of Ra I, oscillator strengths were calculated for the 7s 2 -7s7p transitions using the relativistic pseudo-potential approach (Hafner & Schwarz 1978), the multiconfiguration Dirac-Fock method (Bruneau 1984) and the relativistic local spin density functional (Sen & Puri 1989a). More recently, the multiconfiguration Dirac-Hartree-Fock model was employed to compute oscillator strengths for the 7s 2 1 S 0 -7s7p 1 P…”

Section: Available Atomic Datamentioning

confidence: 99%

“…d Multiconfiguration Dirac-Fock (Bruneau 1984). e Relativistic pseudo-potential (Hafner & Schwarz 1978).…”

Section: Radiative Rates and Lifetimesmentioning

confidence: 99%

Atomic data for radioactive elements Ra I, Ra II, Ac I and Ac II and application to their detection in HD 101065 and HR 465

Quinet

Argante²,

Fivet³

et al. 2007

A&A

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Radiative data for transitions of astrophysical interest in radioactive elements Ra I, Ra II, Ac I and Ac II have been computed using a semi-empirical relativistic Hartree-Fock approach including core polarization effects. Most of the oscillator strengths reported in the present paper are new. A possible detection of radium (Ra II) and actinium (Ac II) in the spectrum of the stars HD 101065 and HR 465 is examined and discussed.

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Bibliography

2018

Screening Constant by Unit Nuclear Charge Method

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Correlation and relaxation effects in ns²-nsnp transitions

Cited by 69 publications

References 31 publications

Detailed Opacity Calculations for Astrophysical Applications

Detailed Opacity Calculations for Astrophysical Applications

Atomic data for radioactive elements Ra I, Ra II, Ac I and Ac II and application to their detection in HD 101065 and HR 465

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Correlation and relaxation effects in ns2-nsnp transitions

Cited by 69 publications

References 31 publications

Detailed Opacity Calculations for Astrophysical Applications

Detailed Opacity Calculations for Astrophysical Applications

Atomic data for radioactive elements Ra I, Ra II, Ac I and Ac II and application to their detection in HD 101065 and HR 465

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Correlation and relaxation effects in ns²-nsnp transitions