Highly doubly excited S states of the helium atom
- 14 August 1995
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 28 (15) , 3163-3183
- https://doi.org/10.1088/0953-4075/28/15/010
Abstract
We calculate and analyse S-wave resonances of helium up to an energy of -0.02 au applying the complex rotation technique. Rydberg series converging to the hydrogenic thresholds of the He+ ion are analysed by quantum defect theory. For moderately excited inner electrons the series converging to different thresholds begin to overlap resulting in perturbed Rydberg series. We find that approximate quantum numbers as well as propensity rules governing the decay of the resonances and the perturbation scheme of the Rydberg series prevail. With increasing excitation of the inner electron however, only series whose states tend to extreme interelectronic angles (cos theta )=+or-1 remain regular.Keywords
This publication has 42 references indexed in Scilit:
- Wavefunctions of atomic resonancesJournal of Physics B: Atomic, Molecular and Optical Physics, 1994
- Inhibited autoionization of planetary atom statesJournal of Physics B: Atomic, Molecular and Optical Physics, 1994
- Observation of the (2p,nddouble-excitation Rydberg series of heliumPhysical Review Letters, 1992
- Extensive double-excitation states in atomic heliumPhysical Review Letters, 1991
- Positive-energy spectrum of the hydrogen atom in a magnetic fieldPhysical Review Letters, 1991
- High precision variational calculations for the 1s21S state of H − and the 1s21s, 1s2s 1s and 1s2s 3s states of heliumNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1988
- Line-shape parameters forFeshbach resonances in He andPhysical Review A, 1984
- Calculation of autoionization of He andusing the projection-operator formalismPhysical Review A, 1975
- On the Convergence of the Hylleraas Variational MethodPhysical Review B, 1937
- Separation of Angles in the Two-Electron ProblemPhysical Review B, 1930