Perturbation calculations of the helium
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M.E. Riley; A. Dalgarno
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Article
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1971
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Elsevier Science
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English
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A comparison is presented for the ground state of the helium atom of high order Rayleigh-Schri)dinger perturbation theories based upon a hydrogenic. a screened hydrogenic, a Hartree and a modified Hartree local zero-order hamiltonian. The hydrogenic zero-order schemes are superior tc the Hartree zer