A new He resonance in the excitation of the (2s2p)3P autoionising state by electrons (original) (raw)

Journal of Physics B-atomic Molecular and Optical Physics, 1985

Abstract

Four He- resonances with all three electrons in the n=2 shell are accessible by electron impact from the He ground state but only two resonances have been identified unambiguously in electron-helium scattering experiments. Experimental evidence for the presence of a He- resonance at 59.90 eV in the excitation cross section of the He**(2s2p)3P autoionising state is presented and discussed.

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