The least squares method for unbound states

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Abstract
The least squares variational method has been shown to be a conceptually and computationally simple means of calculating accurate energies and wavefunctions for the unbound 2s2 1S and 2p2 1S states of He. It has also been used, with basis set functions which are asymptotically correct to a high order, to calculate energies and wavefunctions of the ground stage of H- and of the ground state and several excited bound states of He.