Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collision strengths and transition probabilities for Co II infrared
  forbidden lines   We calculate collision strengths and their thermally-averaged Maxwellian
values for electron excitation and de-excitation between the fifteen lowest
levels of singly-ionised cobalt, Co+, which give rise to emission lines in the
near- and mid-infrared. Transition probabilities are also calculated and
relative line intensities predicted for conditions typical of supernova ejecta.
The diagnostic potential of the 10.52, 15.46 and 14.74 micro-metre transition
lines is briefly discussed.

19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an