caa a22 4500 44586821X CHVBK 20180317145504.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1140/epjd/e2010-10294-8 doi (NATIONALLICENCE)springer-10.1140/epjd/e2010-10294-8 Sakho I. UFR Sciences and Technologies, Department of Physics, University of Ziguinchor, 523, Ziguinchor, Senegal aut Screening constant by unit nuclear charge calculations of $^{1,3}$Se, $^{1,3}$Po and $^{1,3}$De intershell Rydberg states of the helium-like ions below the $\rm N$ [Elektronische Daten] 2 hydrogenic thresholds [I. Sakho] Abstract.: The $_{2}(1,0)_n^{+}$ 1Se, $_{2}(1,0)_{n}^{-}$ 3Se, $_{2}(1,0)_{n}^{-}$ 1P$^{\circ}$, $_{2}(1,0)_{n}^{+}$ 3P$^{\circ}$, $_{2}(0,1)_{n}^{+}$ 1P$^{\circ}$, $_{2}(0,1)_{n}^{-}$ 3P$^{\circ}$, $_{2}(1,0)_{n}^{+}$ 1De and $_{2}(1,0)_{n}^{-}$ 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 2sns 1Se, 2snp 1P$^{\circ}$ and 2pnp 1De ($n \le 4$) autoionizing states with 11 $\le Z \le 28$ 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 $^{1,3}$Se, $^{1,3}$P$^{\circ}$ and $^{1,3}$De doubly excited states as well as in lower than in heavy-Z two-electron systems. EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2010 The European Physical Journal D Springer-Verlag 61/2(2011-01-01), 267-283 1434-6060 61:2<267 2011 61 10053 https://doi.org/10.1140/epjd/e2010-10294-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epjd/e2010-10294-8 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Sakho I. UFR Sciences and Technologies, Department of Physics, University of Ziguinchor, 523, Ziguinchor, Senegal aut NATIONALLICENCE 773 0- The European Physical Journal D Springer-Verlag 61/2(2011-01-01), 267-283 1434-6060 61:2<267 2011 61 10053 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer