Abstract

A recent modification of the intermediate hamiltonian method, intended to circumvent the problem associated with a low-lying continuum in the operator H 0, has been applied to the lithium atom with a basis of discrete hydrogenic functions. The intended raising of the continuum occurs, but not to the extent that the beginning of the continuum is raised above the ground state of the atom; indications are that no basis of discrete hydrogenic eigenfunctions can accomplish this. Since these calculations were performed on the full lithium atom hamiltonian, they are not strictly comparable to those of Fox and Siglillito, in which a simplified hamiltonian was used.

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