High-lying doubly excited states of He and H-:: electron correlations and classification schemes

High-lying doubly excited states of He and H- are studied and energies and intrinsic characteristics of their wave-functions are reported. Results for energies of Po-3 and D-1 doubly excited states associated with the hydrogenic thresholds up to N=20 are presented and compared to available data from the literature. The classification of these doubly excited states by approximate quantum numbers is reexamined. (C) Central European Science Journals. All rights reserved.