Titlebook: Electron Correlations in Molecules and Solids; P. Fulde Textbook 19911st edition Springer-Verlag Berlin Heidelberg 1991 Festkörpertheorie.

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Introduction,f quantum mechanics by . [1.1], . [1.2], . and . [1.3], . [1.4], and others, the paper by . and . [1.5] on the ground state of the H. molecule opened the way to a theoretical understanding of chemical bonding. Their work marks the beginning of quantum chemistry. The Heitler-London ansatz for the gro

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Density Functional Theory,articular. It has given these calculations a sounder theoretical basis than they had previously, when they depended to a considerable extent on model potentials. The theory has also been widely applied to molecules, thereby competing with standard quantum chemical methods, and to the computation of

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Quantum-Chemical Approach to Electron Correlations,ctron problem. Its shortcomings were discussed in Sect. 2.8, where we showed that it is the correlation hole which every electron carries along that is missing in such an approach. The correlation hole prevents electrons from coming too close to each other and reduces their mutual Coulomb repulsion.

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Finite-Temperature Techniques,correlations not only on the ground state but also on the low-energy excitations of the system. Of particular interest is the partition function Z or the free energy F of the electrons. We can deduce from both quantities a number of static thermodynamicproperties. The partition function is the trace

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