Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Binding energies of the $1s^2\,2s\,2p\, ^3P_{0,2}$ states of
  berylliumlike xenon   Binding energies of the $^3P_0$ and $^3P_2$ levels of the $1s^2\,2s\,2p$
electron configuration in berylliumlike xenon are rigorously evaluated using ab
initio QED approach. All relevant one- and many-electron QED contributions are
accounted for up to the second order of the perturbation theory. The
interelectronic-interaction effects of the third and higher orders are
considered within the Breit approximation. Nuclear recoil effect is taken into
account as well. In addition, we study all possible levels of the configuration
$1s^2\,2s\,2p$, namely $^1P_1$ and $^3P_{0,1,2}$, by means of the
configuration-interaction Dirac-Fock-Sturm method in berylliumlike neon, iron,
and xenon. In this case the QED effects are treated approximately within the
model QED approach. The obtained theoretical predictions are compared with the
results of previous relativistic calculations and high-precision measurements.

31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
2
The categories of this paper are: math