Ever since Löwdin /1/ in 1959 wrote his monumental survey of the correlation problem it has been recognized that this problem is one of the central issues in many-electron quantum mechanics. A clear insight into the problem is needed not only when wavefunctions of high accuracy are calculated but also when assessing the possibility of using a relatively poor wavefunction to predict experimental quantities. Although the form of the wavefunction changes greatly in its details from the He atom through molecules to solids and plasma there is a common problem of understanding how the electrons are correlated and how this correlation can be incorporated into the wavefunction.
KeywordsKinetic Energy Operator Orbital Equation Orbital Part Correlation Problem Closed Shell System
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