Abstract
The direct inversion in the iterative subspace (DIIS) technique of Pulay is incorporated within the self consistent field for molecular interactions (SCF-MI) algorithm. It is shown to improve significantly the convergence rate of the conventional SCF-MI iteration scheme. The implemented procedure demonstrates stability and rate of convergence similar to that of standard DIIS-based codes. Its performance is compared to that of the level-shifting technique as applied within the SCF-MI algorithm on test examples involving molecular complexes and standard basis sets.
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