Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Suppression of Dielectronic Recombination Due to Finite Density Effects
  II: Analytical Refinement and Application to Density-dependent Ionization
  Balances and AGN Broad-line Emission   We present improved fits to our treatment of suppression of dielectronic
recombination at intermediate densities. At low densities, most recombined
excited states eventually decay to the ground state, and therefore the total
dielectronic recombination rate to all levels is preserved. At intermediate
densities, on the other hand, collisions can lead to ionization of higher-lying
excited states, thereby suppressing the dielectronic recombination rate. The
improved suppression factors presented here, although highly approximate, allow
summed recombination rate coefficients to be used to intermediate densities.
There have been several technical improvements to our previously presented
fits. For H- through B-like ions the activation log densities have been
adjusted to better reproduce existing data. For B-, C-, Al-, and Si-like ions
secondary autoionization is now included. The treatment of density
discontinuity in electron excitations out of ground state H-, He-, and Ne-like
ions has been improved. These refined dielectronic recombination suppression
factors are used in the most recent version of the plasma simulation code
Cloudy. We show how the ionization and emission spectrum change when this
physics is included. Although these suppression factors improve the treatment
of intermediate densities, they are highly approximate and are not a
substitution for a complete collisional-radiative model of the ionization
balance.

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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: econ