Non-empirical pseudo-potentials for molecular calculations

Our non-empirical pseudo-potential method is tested on the molecules ScH3, TiH3F, MnO4 -, Zn(CH3)2 and Pd(CO)4. The calculations are performed with the PSIBMOL algorithm, described in paper I (Molec. Phys., 1977, 33, 159) at the independent particle restricted Hartree-Fock level with minimal and double-zeta basis sets of Slater orbitals expanded in gaussian functions. The agreement between pseudo-potential and all-electron calculations for these molecules is as good as for non-transition element compounds as concerns valence molecular orbital energies and expectation values of various one-electron operators. The general conclusion of this series (papers I, II and III) is that our non-empirical pseudo-potential method can now be used as a routine tool to predict efficiently the ground-state valence electronic properties of molecules containing any atom of the Periodic Table as far as relativistic effects remain unimportant.