Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accurate evaluations of the field shift and lowest-order QED correction
  for the ground $1^1S-$states of some light two-electron ions   Mass-dependent and field shift components of the isotopic shift are
determined to high accuracy for the ground $1^1S-$states of some light
two-electron Li$^{+}$, Be$^{2+}$, B$^{3+}$ and C$^{4+}$ ions. To determine the
field components of these isotopic shifts we apply the Racah-Rosental-Breit
formula. We also determine the lowest order QED corrections to the isotopic
shifts for each of these two-electron ions.

9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an