TY - JOUR
T1 - Modified Atomic Orbital Calculations for $(1s,nl)^3L^{\pi}$ and $_2 (1,0)_n^{±1,3}S^e$ Excited States of He Isoelectronic Sequence
AU - I. Sakho
JO - Journal of Atomic and Molecular Sciences
VL - 3
SP - 224
EP - 242
PY - 2010
DA - 2010/01
SN - 1
DO - http://doi.org/10.4208/jams.042710.051510a
UR - https://global-sci.org/intro/article_detail/jams/8083.html
KW - atomic orbital theory, screening constant, semi-empirical calculations, autoionizing, excited states, helium isoelectronic sequence.
AB - <p style="text-align: justify;">The singly $(1s,ns)^{3}S^{e}$, $(1s,np)^{3}P^{o}$, $(1s,nd)^{3}D^{e}$ 
excited states and the doubly $_{2}(1,0)_{n}^{+1}S^{e}$ and 
$_{2}(1,0)_{n}^{-3}S^{e}$ $(n\leq10)$ autoionizing states of the helium 
isoelectronic sequence are investigated using Modified Atomic Orbital Theory 
(MAOT). Total energies up to $Z = 10$ and excitation energies with $Z = 2$~$5$ 
are presented and comparison with experimental and theoretical available results 
indicates a good agreement. In addition, the method is applied in the calculation 
of accurate results in very high $Z$ - He isoelectronic sequence with $11\leq Z\leq58$ 
and with $Z = 60,$ 70, 80, 90 and 92 for the $(1s,ns)^{1,3}S^{e}$, $(1s,np)^{1,3}P^{o}$, $(1s,nd)^{1,3}D^{e}$, $_{2}(1,0)_{n}^{+1}S^{e}$ 
and $_{2}(1,0)_{n}^{-3}S^{e}$ $(n\leq7)$ excited states. The results obtained 
for these high $Z$ - He isoelectronic sequence are in good agreement with double 
sums over the complete hydrogen spectrum calculations Ivanov and Safronova.</p>