physics, Coulson–Fischer theory provides a quantum mechanical description of the electronic structure of molecules. The 1949 seminal work of Coulson and Fischer...

Theological Physics.[citation needed] Coulson–Fischer theory Chirgwin–Coulson weights Bent's rule Valence bond theory Molecular orbital List of science and...

combinations of either atomic orbitals, delocalized atomic orbitals (Coulson-Fischer theory), or even molecular orbital fragments. Although this is often overlooked...

develop two other key concepts in VB theory: resonance (1928) and orbital hybridization (1930). According to Charles Coulson, author of the noted 1952 book...

Miessler, Gary L.; Fischer, Paul J.; Tarr, Donald A. (2013-04-08). Inorganic Chemistry. Pearson Education. ISBN 978-0-321-91779-9. Coulson, Charles A. (1952)...

around 1970. The generalized Coulson–Fischer theory for the hydrogen molecule, discussed in Modern valence bond theory, is used to describe every electron...

energy that they may not have (called band gaps or forbidden bands). Band theory derives these bands and band gaps by examining the allowed quantum mechanical...

of the system. Hartree–Fock approximation is an instance of mean-field theory, where neglecting higher-order fluctuations in order parameter allows interaction...

Bibcode:1961JMoSp...5..482H. doi:10.1016/0022-2852(61)90111-4. McWeeny, Roy (1979). Coulson's Valence. Oxford: Oxford University Press. pp. 124–129. ISBN 0-19-855145-2...

Density functional theory (DFT) is a computational quantum mechanical modelling method used in physics, chemistry and materials science to investigate...

Hückel Theory for Organic Chemists, C. A. Coulson, B. O'Leary and R. B. Mallion, Academic Press, 1978. Andrew Streitwieser, Molecular Orbital Theory for...

Time-dependent density-functional theory (TDDFT) is a quantum mechanical theory used in physics and chemistry to investigate the properties and dynamics...

Multi-configuration time-dependent Hartree (MCTDH,) Møller–Plesset perturbation theory (MP2, MP3, MP4, etc.) Quadratic configuration interaction (QCI) Quantum...

In solid-state physics, the k·p perturbation theory is an approximated semi-empirical approach for calculating the band structure (particularly effective...

linear augmented-plane-wave methods, and allows for density functional theory calculations to be performed with greater computational efficiency. Valence...

Møller–Plesset perturbation theory (MP) is one of several quantum chemistry post-Hartree–Fock ab initio methods in the field of computational chemistry...

only three kinds of matrix elements that play a significant role in the theory. Two of those three kinds of elements should be close to zero and can often...

methods Valence bond theory Coulson–Fischer theory Generalized valence bond Modern valence bond theory Molecular orbital theory Hartree–Fock method Semi-empirical...

ISBN 978-1-911298-94-6. Rehr, J J (2005-01-01). "Lars Hedin and the quest for a theory of excited states". Physica Scripta. T115: 19–23. doi:10.1088/0031-8949/2005/T115/001...

In computational chemistry, orbital-free density functional theory (OFDFT) is a quantum mechanical approach to electronic structure determination which...

that includes electronic correlation. CC theory is simply the perturbative variant of the many-electron theory (MET) of Oktay Sinanoğlu, which is the exact...

{\displaystyle U} be nonzero and small. Non-degenerate and degenerate perturbation theory, respectively, can be applied in these two cases to solve for the Fourier...

various Green's function methods. One application is found in the variational theory developed by Jan Korringa (1947) and by Walter Kohn and N. Rostoker (1954)...

In density functional theory (DFT) the adiabatic-connection fluctuation-dissipation theorem (ACFD) is an exact formula for the Kohn–Sham correlation energy...

named after Llewellyn Thomas and Enrico Fermi, is a quantum mechanical theory for the electronic structure of many-body systems developed semiclassically...

periodic solids. In the derivation of the method using multiple scattering theory by Jan Korringa and the derivation based on the Kohn and Rostoker variational...

many-body effects encoded in the wave function, going beyond mean-field theory. In particular, there exist numerically exact and polynomially-scaling algorithms...

optimized effective potential method (OEP) in Kohn-Sham (KS) density functional theory (DFT) is a method to determine the potentials as functional derivatives...

perturbation theory (GLPT) in Kohn–Sham (KS) density functional theory (DFT) is the analogue to what Møller–Plesset perturbation theory (MPPT) is in Hartree–Fock...

can easily be approximated in most regions by perturbation methods. In theory the lattice is infinitely large, so a weak periodic scattering potential...