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). 
Yee Yee Oo, Phyu Phyu San, M. Sampoorna, K. N. Nagendra and G.   Ramachandran