It is shown that the level-shifting technique of Guest and Saunders for improving convergence of open-shell SCF iterations can also be applied to the double-matrix formalism of Roothaan and its extension by Huzinaga. Test cases include the lowest 2Σ+ state of PO and a double open-shell 2Σ+ configuration of NS.
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Grabenstetter et al. (1976) studied this question.
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