van der Burgt, Peter J.M. and Heideman, H.G.M.
(1985)
A new type of He- resonance states in the autoionisation region.
Journal of Physics B: Atomic and Molecular Physics, 18 (21).
L755-L761.
ISSN 0022-3700
Abstract
The authors have studied the near-threshold excitation of autoionising states in electron-helium scattering. Only a particular set of autoionising states is observed in the measurements, which has led them to formulate a selection rule for threshold excitation of autoionising states. Evidence is presented that autoionising states belonging to this particular set are strongly excited near their thresholds by hitherto unknown shape resonances.
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