SUPERPOSITION OF CONFIGURATIONS: THE HELIUM ATOM*
By G.RUSSELL TAYLORt AND ROBERTG.PARR
Communicated by R.S.Mulliken,January7,195
Introduction.
-A very nearly exact approximation to the ground state wavefunction for the helium atom was obtained by Hylleraas in 1930.1His approximation is so accurate that calculation of the ground state wavefunction and energy for helium no longer remains an interesting problem perse,but the extension of his method beyond two-electron problems is quite hopeless.2 The work reported in the present paper the refore was under taken as a step in the development of a systematic, practical procedure for obtaining an accurate wavefunction for any atom or molecule.
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