Screening constant by unit nuclear charge calculations of 1,3Se, 1,3Po and 1,3De intershell Rydberg states of the helium-like ions below the N = 2 hydrogenic thresholds
UFR Sciences and Technologies, Department of Physics, University of Ziguinchor, 523 Ziguinchor, Senegal
Corresponding author: a firstname.lastname@example.org
Revised: 27 August 2010
Published online: 3 December 2010
The 1Se, 3Se, 1P, 3P, 1P, 3P, 1De and 3De intershell autoionizing states of the helium-like ions are studied using the screening constant by unit nuclear charge (SCUNC) method in the framework of a semi-empirical procedure. The results up to Z = 10 compared well to the available experimental and theoretical literature data. In addition, the possibility to apply the SCUNC method in the calculations of energy resonances of heavy-Z helium-like ions is demonstrated in the present work where energy positions for some low-lying 2sns1Se, 2snp1P and 2pnp1De () autoionizing states with 11 are tabulated and comparison with double sums over the complete hydrogen spectrum calculations [A.I. Ivanov, I.U. Safronova, Opt. Spectrosc. 75, 506 (1993)] is made. A host of results presented in this paper may be useful guideline for future experimental and theoretical investigations in high-lying Se, P and De doubly excited states as well as in lower than in heavy-Z two-electron systems.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010