Frequency dependent electron collisional widths for opacity calculations

It is shown that theoretical Rosseland mean opacities are sensitive to spectral line shape models. Due to computational constraints, however, opacity codes typically use Voigt or Lorentz profiles. Both of these profiles have an incorrect far wing behavior that can significantly overestimate the phot...

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Bibliographic Details
Published inHigh energy density physics Vol. 5; no. 1; pp. 97 - 104
Main Authors Iglesias, C.A., Sonnad, V., Wilson, B.G., Castor, J.I.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2009
Subjects
Line shapes
Opacity
Line shapes
32.70.Jz
Opacity
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Summary:It is shown that theoretical Rosseland mean opacities are sensitive to spectral line shape models. Due to computational constraints, however, opacity codes typically use Voigt or Lorentz profiles. Both of these profiles have an incorrect far wing behavior that can significantly overestimate the photon absorption. A new line profile is proposed, based on second-order line broadening theory, which is both more physical and relatively fast to compute.
ISSN:1574-1818
1878-0563
DOI:10.1016/j.hedp.2009.03.003