Abstract
A four-component relativistic self-consistent-field scheme based on the squared Dirac operator is presented. Just as in the one-electron case, discussed previously [Chem. Phys. Lett. 78, 341 (1981)], the variation principle holds and no variational collapse appears if the expansion method is applied. Numerical results with scalar Gaussian-lobe basis sets are given for He, Li, Be, H2, and LiH.

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