Atomic Line De-polarization by Thermal Electron Collision: Quantum Formulation, Application to Fe XIII

In this article is presented an extension to the University-CollegeLondon electron-atom collision code to calculate multipole components of collision strengths. From these atomic data can be derived respective collisional rates, by simple integration over electron distributions. As solar application, Fe xiii forbidden lines are considered. Present data could be of interest in the context of coronal magnetic field topology.