Opacity Calculations for 21 Element Mixtures
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**Session 7 -- Radiative Transfer and Opacities**
*Display presentation, Monday, 9, 1995, 9:20am - 6:30pm*

## [7.05] Opacity Calculations for 21 Element Mixtures

*F. J. Rogers and C. A. Iglesias (Lawrence Livermore National Laboratory)*

It has recently been shown that the opacity for astrophysical
plasmas are significantly increased by the inclusion of detailed
atomic data for iron. These increases can be as large as a factor of
four at temperatures near 200,000 K. Due to the very large increase
in the opacity of iron and nearby elements over earlier calculations,
even elements considerably less abundant than iron also make
important contributions. In the present work we have extended the
OPAL opacity calculations to include 7 additional elements. Other
factors such as improvements in the calculation of the equation of
state and line broadening have also effected the results. We have
also extended the density range of the tables and increased the
number of temperature points. Comparisons will be made with
other recent calculations. Work performed under the auspices of
the U. S. Department of Energy by Lawrence Livermore National
Laboratory under Contract W-7405-ENG-48.

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