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- W2007913793 abstract "A perturbation expansion of the natural orbitals and occupation numbers for two-electron atoms in inverse powers of the nuclear charge has been obtained from the wavefunction of Hylleraas. To second order in 1 / Z, the perturbation expansion gives the following principal occupation numbers: 0.99353 for He, 0.99712 for Li+, 0.99837 for Be++, 0.99959 for O6+; as compared to the results of Davidson for He (0.99200), and those of Marcias for Li+ (0.9967), Be++ (0.9982) and O6+ (0.9996), and also those of Kutzelnigg: 0.99303 for He, 0.99707 for Li+, 0.99838 for Be++, and 0.99962 for O6+." @default.
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- W2007913793 date "1970-05-01" @default.
- W2007913793 modified "2023-10-18" @default.
- W2007913793 title "1 / Z Perturbation Expansion for the Natural Orbitals of Two‐Electron Atoms" @default.
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- W2007913793 doi "https://doi.org/10.1063/1.1673672" @default.
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