Abstract

By using well known methods, which decompose MO wavefunctions, a molecular waveftmction is obtained in the basis of non-orthogonal Slater determinants involving only AOs; the weights of these non-orthogonal determinants are then calculated by means of a method which avoids both the generation (and storage) of the whole determinantal basis set and the calculation of the numerous overlap integrals between non-orthogonal Slater determinants. The method is presented for both cases, when the basis set involves single Slater determinants or spin-eigenfunctions. A numerical application is given in the basis of single Slater determinants in order to illustrate the Hund rule in the 2A 1 electronic state of the BH 2 molecule.

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