![Excitation of He
<sup>+</sup>
to the 2
<sup>2</sup>
S and 2
<sup>2</sup>
P states by electron impact]()
Excitation of He
<sup>+</sup>
to the 2
<sup>2</sup>
S and 2
<sup>2</sup>
P states by electron impactSmith, A C H; Bannister, M E; Chung, Y-S; Djuric, N; Dunn, G H; Neau, A; Popovic, D; Stepanovic, M; Wallbank, B · Journal of Physics B: Atomic, Molecular and Optical Physics · 2001