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Methodological study demonstrates energy minimization in quantum systems through modified wave functions, indicating enhanced accuracy over standard Brillouin-Wigner perturbation theory.
New variational parameters are introduced into the wave function employed in the Brillouin-Wigner perturbation method, and determined to minimize the total energy. The original and modified procedures are illustrated by a numerical example.
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Goldhammer et al. (1956) studied this question.
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