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- W2000450063 abstract "Four resonant states of ${mathrm{He}}^{ensuremath{-}}$ with all three electrons in the $n=2$ shell are accessible by electron impact from the He ground state. These resonances have the structure of an electron attached to an autoionizing state ${mathrm{He}}^{**}$. A discussion is given of the influence of these resonances on electron scattering processes. A theoretical model is proposed that includes the recently postulated post-collision interaction as the second step of a two-step decay process for these resonances. This model is shown to account qualitatively for properties of excitation structures observed in the energy range 57-61 eV, including the apparent selectivity of $L$ values in Rydberg-state excitation. Energies of the ${mathrm{He}}^{ensuremath{-}}$ resonances are computed variationally and are found to be consistent with earlier results for the three lowest resonances. A fourth broad resonance is predicted to occur near 60.4 eV. Experimental evidence for this resonance is discussed." @default.
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- W2000450063 date "1976-10-01" @default.
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- W2000450063 title "<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:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>resonances and the post-collision interaction" @default.
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- W2000450063 doi "https://doi.org/10.1103/physreva.14.1326" @default.
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