Two-photon ionization in solar opacity experiments

Kruse, Michael; Iglesias, Carlos A.

doi:10.1016/j.hedp.2022.100976

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…The purpose is to explore whether or not such ab initio calculations can resolve the reported disagreement between previous atomic physics calculations and measured data [14,19]. The methods used in previous calculations in particular include an average atom model based on timedependent DFT [24], and calculation of opacity from two-photon processes [25,26]. Our DFT results are compared to the real-space Green's function (RSGF) method [27][28][29] and to the radiative emissivity and opacity of dense plasmas (REODP) atomistic model [30].…”

Section: Introductionmentioning

confidence: 99%

First-principles study of L -shell iron and chromium opacity at stellar interior temperatures

Karasiev

Shaffer

et al. 2022

Phys. Rev. E

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Recently developed free-energy density functional theory (DFT)-based methodology for optical property calculations of warm dense matter has been applied for studying L-shell opacity of iron and chromium at T = 182 eV. We use Mermin-Kohn-Sham density functional theory with a groundstate and a fully temperature-dependent generalized gradient approximation exchange-correlation (XC) functionals. It is demonstrated that the role of XC at such a high-T is negligible due to the total free-energy of interacting system being dominated by the noninteracting free-energy term in agreement with estimations for the homogeneous electron gas. Our DFT predictions are compared to the radiative emissivity and opacity of dense plasmas model, to the real-space Green's function method, and to experimental measurements. Good agreement is found between all three theoretical methods, and in the bound-continuum region for Cr when compared to the experiment, while the discrepancy between direct DFT calculations and the experiment for Fe remains essentially the same as for plasma-physics models.

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