Systematics of energies of doubly excited states of heliumlike ions
- 1 May 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 39 (9) , 4355-4361
- https://doi.org/10.1103/physreva.39.4355
Abstract
The dependence of the energy levels of doubly excited states of heliumlike ions on the nuclear charge Z is studied. By expressing the energy levels of doubly excited states for intrashell states in the form of a double-Rydberg formula and for intershell states using the quantum-defect method, we expand the quantum defect in each formula in powers of 1/Z. Using known energy levels for the low-Z ions, we extract parameters of the quantum defect which allow the calculation of accurate energy levels of other ions along the helium isoelectronic sequence.Keywords
This publication has 26 references indexed in Scilit:
- Angular momenta determination of N5+(3L3L') capture states in N7+-He collisionsJournal of Physics B: Atomic and Molecular Physics, 1987
- Transfer excitation in low-energy (keV amu-1) multiply charged ion-atom collisionsJournal of Physics B: Atomic and Molecular Physics, 1986
- Evidence for correlated double-electron capture in low-energy collisions ofwith HePhysical Review Letters, 1986
- Doubly Excited States, Including New Classification SchemesPublished by Elsevier ,1986
- Autoionisation of N5+(nln'l') with n=2,3,4 and n'⩾n measured by electron spectrometry in collisions of N7+with He and H2, at 4.9 keV amu-1Journal of Physics B: Atomic and Molecular Physics, 1984
- Classification and supermultiplet structure of doubly excited statesPhysical Review A, 1984
- Classification of Doubly Excited States of Two-Electron AtomsPhysical Review Letters, 1983
- Two-electron capture into autoionising states of N5+(3l3l') and O5+(1s3l3l') in collisions of N7+and O5+with HeJournal of Physics B: Atomic and Molecular Physics, 1982
- Supermultiplet classification of higher intrashell doubly excited states ofand HePhysical Review A, 1980
- Comparison of doubly-excited helium energy levels, isoelectronic series, autoionization lifetimes, and group-theoretical configuration-mixing predictions with large-configuration-interaction calculations and experimental spectraPhysical Review A, 1975