Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron-Ion Recombination Rate Coefficients and Photoionization Cross
  Sections for Astrophysically Abundant Elements VIII. Ar XIII with new
  features   Ar XIII is found to be unique with new features in electron-ion recombination
not seen in any other ion. The ion has been studied with the unified method
which provides a theoretically self-consistent set of atomic parameters for the
inverse processes of photoionization and total electron-ion recombination. The
unified method subsumes both the radiative recombination (RR) and dielectronic
recombination (DR) within the framework of close-coupling formulations using
the R-matrix method. A set of four DR "bumps", two in the low and two in the
high temperature regions, is found to exist in the recombination rates of Ar
XIV + e $\to$ Ar XIII. This is in contrast to two typical DR "bumps", one at
high temperature common for most ions and one at low temperature depending on
the presence of near threshold autoionizing resonances in the bound-free
process. The large scale ab initio calculations for Ar XIII employ
eigenfunction expansion of 37 core Ar XIV states from n = 2 and 3 complexes.
This enables core excitations of type $\Delta n$ = 0 and 1. Ar XIII exhibits
more extensive resonant structures and wider PEC (photoexitation-of-core)
resonances for n = 3 core states than those of n = 2 states. Hence the high
energy region of photoionization and recombination are dominated by these
structures. Total and partial photoionization cross sections of all bound
states, state-specific recombinaion rates of 561 bound states and total
recombination rate coefficients are presented.

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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: stat
8
The categories of this paper are: hep-ex