Abstract
In this paper, resonance energies and excitation energies of doubly 2sns 1,3Se, 2snp 1,3P0, 2pnp 1,3De, 2pnd 1,3F0 and 2pnf 1,3Ge excited states of the helium isoelectronic sequence with Z ≤ 10 are calculated. Calculations are carried out in the framework of the variational procedure of the formalism of the Screening Constant per Unit Nuclear Charge (SCUNC). New correlated wave function of Hylleraas type is used. Precise resonance and excitation energies are tabulated and good agreement is obtained when a comparison is made with available literature values.
Highlights
Study of Doubly Excited States (DES) of He-like ions remains an active field of investigation due to their importance in the interpretation of astrophysical data [1] [2]
The results obtained in the present study for the resonance energies and the excitation energies of the doubly excited 2sns 1,3Se, 2snp 1,3P0, 2pnp 1,3De, 2pnd F 1,3 0 and 2pnf G 1,3 e states with n = 2 - 10 of the helium isoelectronic sequence (Z = 2 10) are presented in Tables 1-14 where a comparison between our present results and the experimental and theoretical values available in the literature is made
Calculations are made in the framework of the variational procedure of the Screening Constant by Unit Nuclear Charge (SCUNC) formalism
Summary
Study of Doubly Excited States (DES) of He-like ions remains an active field of investigation due to their importance in the interpretation of astrophysical data [1] [2]. These states were first observed by Madden and Codling [3] [4] in photoabsorption experiments on helium using synchrotron radiation, and further experimental studies have shown their presence in highly charged ions [5]. The understanding of elementary processes in the collisions of electrons with atoms or ions is very important in plasma physics, laser technology, astrophysics and physics of the upper atmosphere
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