semiclassical approximation to quantum mechanics

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• Perturbation theory (quantum mechanics) — In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a …   Wikipedia

• Quantum chemistry — is a branch of theoretical chemistry, which applies quantum mechanics and quantum field theory to address issues and problems in chemistry. The description of the electronic behavior of atoms and molecules as pertaining to their reactivity is one …   Wikipedia

• Quantum chaos — is a branch of physics which studies how chaotic classical systems (see dynamical systems and chaos theory) can be shown to be limits of quantum mechanical systems. The phenomena covered by quantum chaos so far are mainly related to wave theory.… …   Wikipedia

• Semiclassical — In physics, the adjective semiclassical has different precise meanings depending on the context. All these meanings usually refer to some approximation, limit or situation that combines quantum and classical aspects in a given problem. Some of… …   Wikipedia

• Quantum tunnelling — In quantum mechanics, quantum tunnelling is a nanoscopic phenomenon in which a particle violates the principles of classical mechanics by penetrating a potential barrier or impedance higher than the kinetic energy of the particle.Razavy, Mohsen.… …   Wikipedia

• WKB approximation — In physics, the WKB (Wentzel–Kramers–Brillouin) approximation, also known as WKBJ (Wentzel–Kramers–Brillouin–Jeffreys) approximation, is the most familiar example of a semiclassical calculation in quantum mechanics in which the wavefunction is… …   Wikipedia

• List of mathematical topics in quantum theory — This is a list of mathematical topics in quantum theory, by Wikipedia page. See also list of functional analysis topics, list of Lie group topics, list of quantum mechanical systems with analytical solutions. Contents 1 Mathematical formulation… …   Wikipedia

• High frequency approximation — A high frequency approximation (or high energy approximation ) for scattering or other wave propagation problems, in physics or engineering, is an approximation whose accuracy increases with the size of features on the scatterer or medium… …   Wikipedia

• Analyse semi-classique — Régime semi classique Le régime semi classique d un système physique en mécanique quantique est le régime pour lequel les actions du système physique étudié sont grandes devant le quantum d action . Mathématiquement, cela revient à effectuer un… …   Wikipédia en Français

• Limite semi-classique — Régime semi classique Le régime semi classique d un système physique en mécanique quantique est le régime pour lequel les actions du système physique étudié sont grandes devant le quantum d action . Mathématiquement, cela revient à effectuer un… …   Wikipédia en Français

• Regime semi-classique — Régime semi classique Le régime semi classique d un système physique en mécanique quantique est le régime pour lequel les actions du système physique étudié sont grandes devant le quantum d action . Mathématiquement, cela revient à effectuer un… …   Wikipédia en Français