Abstract
In this work, matrix equations for obtaining the half-projected Hartree-Fock (HPHF) function from pseudo-eigenvalue equations in a non-orthogonal basis are given, similarly as in the unrestricted Hartree-Fock model. The potential energy curve for the ground state of the LiH molecule is calculated by using a 6-311(2d,2p) gaussian basis set. Finally, in order to test the HPHF model, some spectroscopic parameters are calculated. Relatively good agreement with experiment is found for the anharmonicity constant.
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