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Physics
Atomic and Condensed Matter
Electron correlation vs electron exchange
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[QUOTE="DrDu, post: 6410330, member: 210532"] Let me add this: The most classical approximation to a many electron problem is via a Hartree product wavefunction. To get exchange symmetry, you have to consider all permutations and end up with a Slater matrix. This is the most general wavefunction describing somehow non-correlated electrons (each electron sees only the average field of the other electrons). The fully correlated wavefunction cannot be expressed as a single determinant but only as a (in principle infinite) sum of these. This is called the full CI (configuration interaction) limit. [/QUOTE]
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Atomic and Condensed Matter
Electron correlation vs electron exchange
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