Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Plasma environment effects on K lines of astrophysical interest. V.
  Universal formulae for ionization potential and K-threshold shifts   Aims. We calculate the plasma environment effects on the ionization
potentials (IPs) and K-thresholds used in the modeling of K lines for all the
ions belonging to the isonuclear sequences of abundant elements apart from
oxygen and iron, namely: carbon, silicon, calcium, chromium, and nickel. These
calculations are used to extend the data points for the fits of the universal
formulae, first proposed in our fourth paper of this series, to predict the IP
and K-threshold lowerings in any elemental ion.
  Methods. We used the fully relativistic multi-configuration Dirac-Fock (MCDF)
method and approximated the plasma electron-nucleus and electron-electron
screenings with a time-averaged Debye-Huckel potential. Results. We report the
modified ionization potentials and K-threshold energies for plasmas
characterized by electron temperatures and densities in the ranges of 10^5-10^7
K and 10^18-10^22 cm^-3 . In addition, the improved universal fitting formulae
are obtained.
  Conclusions. We conclude that since explicit calculations of the atomic
structures for each ion of each element under different plasma conditions is
impractical, the use of these universal formulae for predicting the IP and
K-threshold lowerings in plasma modeling codes is still recommended. However,
their comparatively moderate to low accuracies may affect the predicted
opacities with regard to certain cases under extreme plasma conditions that are
characterized by a plasma screening parameter of \mu > 0.2 a.u., especially for
the K-thresholds.

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The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th