Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transition frequency shifts with fine-structure constant variation for
  Fe I. Isotope shift calculations in Fe I and Fe II   In this paper we calculated the relativistic corrections to transition
frequencies (q factors) of Fe I for the transitions from the even- and
odd-parity states to the ground state. We also carried out isotope shift
calculations in Fe I and Fe II. To the best of our knowledge, the isotope shift
in Fe I was calculated for the first time.

35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci