van der Burgt, Peter J.M. and van Eck, J. and Heideman, H.G.M.
(1985)
A new He- resonance in the excitation of the (2s2p)3P autoionising state by electrons.
Journal of Physics B: Atomic and Molecular Physics, 18 (6).
L171-L174.
ISSN 0022-3700
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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