Coulomb-phase effects in electron-ion scattering

Inclusion of the Coulomb phase in the calculation of the scattering amplitude is important. Previous calculations of the resonance fluorescence polarization of the Be II $2p-2s$ decay after electron excitation omitted the phase and are shown to be incorrect. Differential cross sections for the Mg II $3s\to 3p$ transition are also presented, which also exhibit peculiar effects caused by the Coulomb phase.