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- W2012136481 abstract "Expectation values for [Formula: see text], n = 2, 1, −1, −2, and 1/r 12 for the 1 S state of helium have been calculated using numerical Hartree orbitals. These were then modified by use of the Delves principle, approximating the auxiliary vector of the Delves formalism with a nine-term basis formed from the numerical excited orbitals of the ground state Hartree operator. The modified expectations were then compared with the essentially exact calculations of Pekeris. Results are mixed: excellent for n = 1,2, modest for 1/r 12 , and poor for n = −1, −2. It is conjectured that the latter results are due to a deficiency of s orbitals in the basis used engendering a poor approximation to the auxiliary vector for these operators." @default.
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- W2012136481 date "1972-04-01" @default.
- W2012136481 modified "2023-09-26" @default.
- W2012136481 title "Delves Principle Applied to Helium Using a Numerical Excited Hartree Basis" @default.
- W2012136481 doi "https://doi.org/10.1139/p72-099" @default.
- W2012136481 hasPublicationYear "1972" @default.
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