Screening constant by unit nuclear charge calculations for (n s

Screening Constant by Unit Nuclear Charge (SCUNC) is a new analytical method suitable for the treatment of the properties of He-like systems. In this paper, the possibilities of the method are demonstrated for calculating in the framework of semi-empirical procedure, total energies, total electron-electron interaction energies and excitation energies for (ns2)1Se, (np2)1De and (Nsnp)1P° doubly excited states of He-like ions. The proposed semi-empirical scheme, leads to accurate results in good agreement as well as with available other theoretical results than experimental data

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

Energies of singlet doubly excited states $2p^2$ 1D, $3d^2$ 1G, $4f^2$ 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

Nanoflexitouch - Programme P2N edition 2012

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