Eur. Phys. J. D 13, 21-25 (2001)
https://doi.org/10.1007/s100530170282

Energies and electron correlation effects in two-electron doubly excited (n l)² states

Department of physics, University Cheikh Anta Diop, Dakar, Senegal

Corresponding author: ^a wague@ucad.refer.sn

Received: 30 March 2000
Revised: 4 July 2000
Published online: 15 January 2001

Abstract

Energies of singlet doubly excited states ¹D, ¹G, ¹I of He isoelectronic series are calculated in the framework of the variational method by using Hylleraas-type wave functions and a real Hamiltonian. The results obtained show quantitatively the importance of electron correlation effects in the doubly excited states and they are in good agreement with some experimental data and other theoretical results.