Extension of the method of partial retention of diatomic differential overlap to second row atoms and transition metals

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Abstract
The method of partial retention of diatomic differential overlap (PRDDO) has been extended to the elements through the first transition series. A minimum basis set of Slatertype orbitals is employed, with optional 3d functions on atoms in the second major row. The 3d shell for transition metal atoms is a fixed-contracted double-zeta combination of Slater orbitals. The method retains the basic n(3) dependency inherent in PRDDO. Limited one-center parameterization and empirical two-center exchange integrals are included. The overall accuracy of the approach is comparable to that of the PRDDO method as previously applied to molecules containing first-row atoms only.

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