Scattering of Polarized Radiation by Atoms in Magnetic and Electric   Fields
  The polarization of radiation by scattering on an atom embedded in combined external quadrupole electric and uniform magnetic fields is studied theoretically. Analytic formulae are derived for the scattering phase matrix. Limiting cases of scattering under Zeeman effect, and Hanle effect in weak magnetic fields are discussed. 
Yee Yee Oo, K. N. Nagendra, Sharath Ananthamurthy and G. Ramachandran