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- W2008516631 abstract "Variational calculations for the energy levels of doubly excited $3dnf$ $(^{1,3}D^{ensuremath{circ}})$ states $(n=4--12)$ for helium have been performed using the extended Hylleraas basis set. No previous calculations for the energy eigen-values for the $3dnf$ $(^{1,3}D^{ensuremath{circ}})$ states for $(n=7--12)$ exist. Prediction of two-electron--one-photon peaks at 12.220, 12.649, 12.859, 12.978, 13.054, 13.110, 13.141, 13.168 and $13.213phantom{rule{0.3em}{0ex}}mathrm{eV}$ corresponding to the transitions $2{p}^{2}$ $(^{3}P^{mathrm{e}})ensuremath{rightarrow}3dnf$ $(^{3}D^{ensuremath{circ}})$ $(n=4--12)$, respectively, is reported here. Highly precise energy eigenvalues of doubly excited $2pnd$ states $(^{1,3}D^{ensuremath{circ}})$ $(n=3--8)$ for helium are also reported and the upper bound energies are the lowest yet obtained. The effective quantum numbers $({n}^{*})$ of the above mentioned states are calculated using quantum defect theory." @default.
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- W2008516631 date "2008-09-04" @default.
- W2008516631 modified "2023-10-18" @default.
- W2008516631 title "Ritz variational calculation for two-electron–one-photon transitions in helium" @default.
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- W2008516631 doi "https://doi.org/10.1103/physreva.78.032505" @default.
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