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Herrick, D.R. and Sinanoǧlu, O. (1975) Comparison of Doubly-Excited Helium Energy Levels, Isoelectronic Series, Autoionization Lifetimes, and Group-Theoretical Configuration-Mixing Predictions with Large-Configuration-Interaction Calculations and Experimental Spectra. Physical Review A, 11, 97-110.
https://doi.org/10.1103/physreva.11.97

has been cited by the following article:

• TITLE: Calculation of Resonance Energies of 1,3P0, 1,3De, 1,3F0, 1,3Ge, 1,3H0 Doubly Excited States of Helium-Like Ions Systems Associated with n = 2, 3 and n = 4 Hydrogenic Thresholds Using the Hylleraas-Type Wave Functions

  AUTHORS: Matabara Dieng

  KEYWORDS: Hylleraas Method, Helium-Like Ions Systems, Kinetic Energy, Electrons-Nucleus Interaction, Electron-Electron Interaction

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.14 No.2, February 14, 2026

  ABSTRACT: In this paper, the kinetic energy, the electrons-nucleus interaction energy, the electron-electron interaction energy and the total energy of doubly excited states of He-like ions are developed in the framework of the variational method using configuration interaction basis with a real Hamiltonian. Correlated Hylleraas-type wave functions are also used in this work in which several lower-lying doubly excited (nl1nl2; l1 ≠ l2) 1,3P0, 1,3De, 1,3F0, 1,3Ge, 1,3H0 intrashell resonances associated with n = 2, 3 and 4 thresholds up to Z = 10 are reported. The results obtained are compared with some theoretical calculations of the available literature.