A simple variational-perturbational appr
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L.S. Cederbaum; K. Scho¨nhammer; W. von Niessen
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Article
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1975
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Elsevier Science
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English
β 231 KB
A simp!e ansat;: for the gound state of atoms and molecules is proposed which is also suitable for large internuclear dis-tanc~ where pertrxbation theory breaks down. In its simplest form, where only doubly+xcited configurations are included, the ansatz leads to 97.3% of the exact correhtion energy