Observation of a Broad Resonance in theExcitation of Helium by Electron Impact
- 7 August 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 29 (6), 327-329
- https://doi.org/10.1103/physrevlett.29.327
Abstract
We have observed a broad -wave resonance at about 50 eV primary energy in the angular distribution of electrons scattered after excitation of the state of helium. The resonance has a width of about 15 eV and affects the differential excitation cross section by more than 3 orders of magnitude. It is suggested that this resonance is associated with the temporary formation of triply excited states of the negative helium ion.
Keywords
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