Abstract
Expressions are derived for the nonrelativistic energy of the 1s2s2p configuration. In both the possible electron momentum binding systems (1s2s)2p and 1s(2s2p) values are determined for the parameters of the generalized hydrogenlike analytical radial orbitals for a lithium atom and a negative helium ion. The Li and He− energy spectra in the 1s2s2p configuration are compared with the theoretical calculations of other authors and with experimental data.
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