Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization phase matrices for radiation scattering on atoms in
  external magnetic fields: The case of forbidden transitions in astrophysics   Using a quantum electrodynamical approach, we derive the scattering phase
matrices for polarized radiation involving forbidden line transitions and in
the presence of an external magnetic field. The case of (J=0->2->0) scattering
is considered as an example. The non-magnetic Rayleigh scattering phase matrix
is also presented. The Stokes profiles in a single scattering event are
computed for the strong field (Zeeman) and weak field (Hanle) limits, covering
also the regime of intermediate field strengths (Hanle- Zeeman).

13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
1
The categories of this paper are: cs