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- W2034168459 abstract "We have computed to high accuracy the energies and the total widths of five triply excited n=2 intrashell resonances in ${mathrm{He}}^{mathrm{ensuremath{-}}}$, the 2${mathit{s}}^{2}$2p $^{2}$${mathit{P}}^{mathit{o}}$, 2s2${mathit{p}}^{2}$ $^{2}$${mathit{D}}^{mathit{e}}$, $^{4}$${mathit{P}}^{mathit{e}}$, $^{2}$${mathit{P}}^{mathit{e}}$, and 2${mathit{p}}^{3}$ $^{2}$${mathit{D}}^{mathit{o}}$. These states are characterized by strong localized and asymptotic correlation effects and by their proximity to He doubly excited states. The possible many open channels correspond not only to one- but also to two-electron continua. The resonance parameters were established by applying the complex-coordinate rotation method with large basis sets of orbital and ${mathit{r}}_{mathit{i}mathit{j}}$-correlated configurations. The expansion length of the trial wave functions went up to 1300 terms for the 2s2${mathit{p}}^{2}$ $^{2}$${mathit{D}}^{mathit{e}}$ resonance. This resonance is found to be below the He 2s2p $^{3}$${mathit{P}}^{mathit{o}}$ threshold, in agreement with experimental observations and contrary to existing theoretical results. Similarly, the position of the 2s2${mathit{p}}^{2}$ $^{2}$${mathit{P}}^{mathit{e}}$ resonance is also below the He 2${mathit{p}}^{2}$ $^{3}$${mathit{P}}^{mathit{e}}$ threshold, in agreement with a recent theoretical prediction. The widths of these states range from 10 meV for the 2s2${mathit{p}}^{2}$ $^{4}$${mathit{P}}^{mathit{e}}$ to 331 meV for 2${mathit{p}}^{3}$ $^{2}$${mathit{D}}^{mathit{o}}$." @default.
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- W2034168459 date "1995-01-01" @default.
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- W2034168459 title "Energies and widths of triply excited<i>n</i>=2 intrashell autoionizing states of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>He</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>" @default.
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- W2034168459 doi "https://doi.org/10.1103/physreva.51.204" @default.
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