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Τι (ποιος) είναι N-electron valence state perturbation theory - ορισμός
N-electron valence state perturbation theory
In quantum chemistry, n-electron valence state perturbation theory (NEVPT) is a perturbative treatment applicable to multireference CASCI-type wavefunctions. It can be considered as a generalization of the well-known second-order Møller–Plesset perturbation theory to multireference Complete Active Space cases.
VSEPR theory
![[[Hexamethyltungsten]], a transition metal complex whose geometry is different from main-group coordination.](https://commons.wikimedia.org/wiki/Special:FilePath/Hexamethyl-tungsten-3D-balls.png?width=200 "[[Hexamethyltungsten]], a transition metal complex whose geometry is different from main-group coordination.")
![[[Xenon hexafluoride]], which has a distorted octahedral geometry.](https://commons.wikimedia.org/wiki/Special:FilePath/Xenon-hexafluoride-3D-SF.png?width=200 "[[Xenon hexafluoride]], which has a distorted octahedral geometry.")
THEORETICAL MODEL USED IN CHEMISTRY
VSEPR; VSEPR model; VSEPR Theory; Valence shell electron pair repulsion; AXE method; Valence Shell Electron Pair Repulsion; Valence Shell Electron Pair Repulsion Theory; Valence State Electron Pair Repulsion; Valence state electron pair repulsion; Molecule shape; Vespr; Vsper; Vsepr theory; Valence shell electron repulsion theory; AXE method (chemistry); Steric number; Valance shell electron pair repulsion theory; Vsepr; Valence-Shell-Electron-Pair Repulsion theory; Kepert model; Valence shell electron pair repulsion theory
Valence shell electron pair repulsion (VSEPR) theory ( , ), is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms. It is also named the Gillespie-Nyholm theory after its two main developers, Ronald Gillespie and Ronald Nyholm.
Perturbation theory
MATHEMATICAL METHODS USED TO FIND AN APPROXIMATE SOLUTION TO A PROBLEM WHICH CANNOT BE SOLVED EXACTLY
Perturbation methods; Pertubation Theory; Perturbation analysis; Perturbation (mathematics); Perturbation Theory; First-order non-singular perturbation theory; Higher order terms; Higher-order terms; Perturbation series; Perturbation theory (mathematics); Small perturbations
In mathematics and applied mathematics, perturbation theory comprises methods for finding an approximate solution to a problem, by starting from the exact solution of a related, simpler problem. A critical feature of the technique is a middle step that breaks the problem into "solvable" and "perturbative" parts.
