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Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions

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arxiv astro-ph/9601009 v2 pith:SZANWSDM submitted 1996-01-03 astro-ph atom-ph

classification astro-phatom-ph
keywords crossfitssectionsphotoionizationanalyticatomsionsastrophysics
verification ladder T0 review T1 audit T2 compute T3 formal
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We present a complete set of analytic fits to the non-relativistic photoionization cross sections for the ground states of atoms and ions of elements from H through Si, and S, Ar, Ca, and Fe. Near the ionization thresholds, the fits are based on the Opacity Project theoretical cross sections interpolated and smoothed over resonances. At higher energies, the fits reproduce calculated Hartree-Dirac-Slater photoionization cross sections.

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