Answers are grounded in this paper and cite their sources.
Electron collisional excitation of the 4D, 5D, 4P, and 6S states of Na has been measured with about 30-meV energy resolution. Very rapid, unresolved threshold onsets are seen for all but the 4P state, and a near-threshold resonance is suggested by the 5D data. However, only weak undulations in the cross sections are observed above threshold.
No takes yet. Share an insight, caveat, or question.
Marinković et al. (1992) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: