Abstract
A recent article by Williams et al. [Phys. Rev. A 85, 022701 (2012)] highlights a discrepancy between experiment and theory for the linear light polarization ${P}_{2}$ measured after impact excitation of zinc atoms by a spin-polarized electron beam. The claim is made that current collision theories must be modified by including a geometric (Berry) phase in the calculations in order to reproduce the experimental data for Zn and similar data from the M\unster group for Hg. We show that the $e$-Hg data can be qualitatively reproduced by our fully relativistic $B$-spline $R$-matrix approach without any further modification.
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