Resolution of a significant discrepancy in the electron impact excitation of the 3s[3/2]1 and 3s′[1/2]1 low-lying electronic states in neon

•Absolute differential and integral cross sections for electron impact excitation of neon atom were measured in 20-300 eV.•Our ICS strongly supported those from the recent large-scale B-spline R-matrix computations.•The present results resolved a serious discrepancy between earlier experimental results and theory.

We report results on new absolute cross section measurements for electron impact excitation of the two lowest 3s[3/2]1 and 3s′[1/2]1, optically-allowed electronic-state levels in neon. Those measurements were conducted at eight specific energies in the 20-300 eV energy range. The present results, at the integral cross section level, strongly support those from the recent large-scale B-spline R-matrix computations [O. Zatsarinny, K. Bartschat, Phys. Rev. A 86 (2012) 022717], and resolve a serious discrepancy that had existed between earlier experimental results and theory. Some discrepancies in the differential cross sections, at middle and backward angles, are however still noted.

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