Lowest inelasticHe−autodetachment state (P∘2) in a Feshbach resonance
- 1 June 1981
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 23 (6), 3361-3364
- https://doi.org/10.1103/physreva.23.3361
Abstract
The lowest inelastic () resonance in the scattering of electrons from helium is recalculated using the quasiprojection formalism. An eigenvalue has been found at 20.52 eV using a closed-shell target ground-state quasiprojector, and is confirmed by using an open-shell target projector (yielding eV). The width is also calculated and is very large: eV, thus unambiguously showing that the well-known experimental structure at ∼20.3 eV is a Feshbach and not a shape resonance. The associated nonresonant continuum phase shift reveals a pronounced enhancement beyond the threshold. This finding supports the observational inference of a second (shape) resonance at 20.8 eV by Phillips and Wong.
Keywords
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