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- W1981837720 abstract "The variational-perturbation method has been applied to the study of correlation effects in the helium atom. Starting from the Hartree-Fock Hamiltonian as zeroth-order approximation, we have evaluated the correlation energy through fifth order in perturbation theory. With a ten-parameter trial wave function we get ${E}_{mathrm{corr}}=ensuremath{-}0.0419$ atomic units, which differs from the exact value by 0.4% and shows the rapid convergence of this type of Hartree-Fock perturbation theory. Comparison is also made with similar calculations using Hartree or hydrogenic Hamiltonians as starting points." @default.
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- W1981837720 date "1966-06-03" @default.
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- W1981837720 title "Correlation Effects in Atoms. I. Helium" @default.
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- W1981837720 doi "https://doi.org/10.1103/physrev.146.1" @default.
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