Abstract
The Messmer method for obtaining approximate wavefunctions for excited states is applied to the problem of calculating a wavefunction for the 2s electron in the lithium atom with the influence of the 1s electrons (excluding exchange effects) represented by a core potential. Values obtained for ( r -1), ( r) and ( r 2) differ by 1, 4 and 9%, respectively, from those calculated using a full Hartree-Fock function (Clementi).
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