Triply excited states of three-electron atomic systems
- 1 October 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 12 (4), 1176-1196
- https://doi.org/10.1103/physreva.12.1176
Abstract
A formalism is discussed whereby many-electron systems may be described by a great number of product functions of different configurations in a manageable way. Calculations are made to find triply excited energy levels of three-electron atomic systems, using products of hydrogenic functions with a equal to that of the nucleus. Results for the lowest and levels in the Li isoelectronic sequence, , are presented. The results of calculations for the energies of triply excited states in are also reported. The calculated energies are compared with available experimental and other theoretical values. Finally, the lowest and two lowest energy levels in the isoelectronic sequence are fitted by a perturbation expansion. It is seen that this expansion can be used to estimate the energy levels of such states for higher nuclear charges.
Keywords
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