Variance of the distributions of energy levels and of the transition arrays in atomic spectra

Bauche‐Arnoult, C.; Bauche, J.; Klapisch, M.

doi:10.1103/physreva.20.2424

Cited by 243 publications

(150 citation statements)

References 24 publications

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“…For the present comparisons, the former is considered the best result and used as reference for the other calculations. There is also a calculation using the UTA model [2] (UTA-LS).…”

Section: Dla and Uta Modelsmentioning

confidence: 99%

“…It is then fitting to assess the PRTA models described in Section 4.2 by contrasting them with a hybrid scheme that complements the DLA method with the UTA approach. Here the line limit switch from DLA to UTA-LS [2] is set the same as for the hybrid PRTA models. Table 3 The total number of spectral lines, € N tot , in the various calculations are given in Table 3.…”

Section: Hybrid Uta Modelsmentioning

confidence: 99%

“…1 through 4 display UTA calculations using the LS basis including the spinorbit interaction [2] as well as calculations with the spin-orbit split-array method [3] (here referred to as UTA-LS and SOSA, respectively). The figures show the PRTA in better agreement with DLA than either UTA approaches.…”

Section: Calculation Detailsmentioning

confidence: 99%

“…It is convenient to use the LS representation and explicitly separate the spin-orbit interaction contribution to the variance [2],…”

Section: Rpta Model In Intermediate Couplingmentioning

confidence: 99%

“…For complex ions, however, the myriad spectral lines make DLA calculations impractical [1]. One approach to circumvent this impasse is the unresolved transition array (UTA) model where the lines are treated as a single unresolved feature [2,3]. The UTA model gives compact formulas for the transition array strength-weighted energy mean and variance that together with a Gaussian assumption for the line energy-strength correlation function allows for a fast calculation of the spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Statistical line-by-line model for atomic spectra in intermediate coupling

Iglesias

2012

High Energy Density Physics

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The partially resolved transition array (PRTA) model is extended from JJ to intermediate coupling. The PRTA model conserves known array properties, yields improved higher moments, and systematically accounts for initial level populations. In addition, a random PRTA (R-PRTA) model is proposed to simulate detailed line accounting (DLA) calculations of complex spectra.Numerical examples show that the PRTA model with intermediate coupling reproduces the effects of the electrostatic interaction between spin-orbit split arrays on the spectrum. They also show that the R-PRTA model is in good agreement with DLA results and accounts for systematic line coincidences across transition arrays differing only in the subshell occupation of excited spectator electrons important in opacity calculations. Both PRTA and R-PRTA models are computationally much faster than DLA calculations. Hence, the models can accelerate spectrum calculations without introducing significant uncertainties whenever the DLA method is considered arduous or impractical.

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“…For the present comparisons, the former is considered the best result and used as reference for the other calculations. There is also a calculation using the UTA model [2] (UTA-LS).…”

Section: Dla and Uta Modelsmentioning

confidence: 99%

Section: Hybrid Uta Modelsmentioning

confidence: 99%

Section: Calculation Detailsmentioning

confidence: 99%

“…It is convenient to use the LS representation and explicitly separate the spin-orbit interaction contribution to the variance [2],…”

Section: Rpta Model In Intermediate Couplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Statistical line-by-line model for atomic spectra in intermediate coupling

Iglesias

2012

High Energy Density Physics

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Opacity calculations in X and XUV range using a detailed atomic code

Poirier

2018

Contributions to Plasma Physics

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Calculations of accurate opacities in X and XUV range are of high interest for several domains such as astrophysics or inertial fusion science. Such quantities may be investigated through laser-plasma interaction in the indirect-drive scheme. In this work absorption properties of such plasmas are analysed using the Flexible Atomic Code. Detailed and unresolved-transition-array modes are investigated, and some results obtained with the mixed mode recently developed are also proposed. For a carbon plasma the present approach agrees with the results obtained with the superconfiguration code SCO. Some results are provided about the X-ray opacity of nickel, and a comparison with data from a recent campaign on LULI 2000 facility is done. This comparison demonstrates that the Unresolved Transition Array approach may be insufficient, e.g., to determinate the accurate position and shape of the 2p-3d structure in nickel at about 25 eV. The case of non-electric-dipole-type transitions, such as magnetic dipole transitions is addressed. The electric-dipole and magnetic-dipole transitions are studied here in the case of the 3 * n complex of five tungsten ions, with charge states similar to those found in the tokamak divertors. It is demonstrated that the unresolved transition array formulas provide a fairly accurate description of the most important absorption structures, but fail to reproduce correctly the behavior of the opacity in the wings of these main structures.

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Theory of Atoms in Dense Plasmas

1989

Physics of Highly-Ionized Atoms

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Variance of the distributions of energy levels and of the transition arrays in atomic spectra

Cited by 243 publications

References 24 publications

Statistical line-by-line model for atomic spectra in intermediate coupling

Statistical line-by-line model for atomic spectra in intermediate coupling

Opacity calculations in X and XUV range using a detailed atomic code

Theory of Atoms in Dense Plasmas

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