Abstract
We present relativistic convergent close-coupling and Breit-Pauli -matrix calculations for the polarization of the light emitted after electron-impact excitation of the transition in . While we find consistency between the theoretical predictions, a discrepancy persists with the measurements of Goto et al. [Phys. Rev. A 27, 1844 (1983)]. Cascade contributions and hyperfine depolarization effects were calculated and found to have negligible effect on the polarization fraction. We also present angle-integrated cross sections for the state to compare with the measurements of Gomonai [Optc. Spect. 94, 488 (2003)]. Agreement between theory and experiment is far from perfect, especially at low energies, where they disagree both in the absolute values and the energy dependence of the cross sections.
- Received 16 June 2014
DOI:https://doi.org/10.1103/PhysRevA.90.012707
©2014 American Physical Society