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Quantum chemistry. Quantum chemistry, a branch of theoretical chemistry, deals with the application of quantum mechanics to questions in chemistry . Wikimedia Commons has media related to Quantum chemistry.
Topic hierarchy. Thumbnail: The 2pz 2 p z Orbitals of the Hydrogen Atom. (CC-BY-SA-NC 3.0; anonymous) Unit 1. Quantum Chemistry. In this unit, we describe how electrons are arranged in atoms and how the spatial arrangements of electrons are related to their energies. In the next unit, this will allow us to explain how the ….
Koopmans-Theorem. Das Koopmans-Theorem ist eine nach dem niederländisch-amerikanischen Physiker T. C. Koopmans benannte Näherung . In ihr wird angenommen, dass sich die Lage der Energieniveaus eines Atoms oder Moleküls bei seiner Ionisierung nicht ändert. Dadurch ist die Ionisationsenergie für das höchste besetzte Molekülorbital ...
The multiplicity is often equal to the number of possible orientations of the total spin [3] relative to the total orbital angular momentum L, and therefore to the number of near– degenerate levels that differ only in their spin–orbit interaction energy. For example, the ground state of a carbon atom is 3 P ( Term symbol ).
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 mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak ...
Quantum yield is defined by the fraction of excited state fluorophores that decay through fluorescence: where. Φf is the fluorescence quantum yield, kf is the rate constant for radiative relaxation (fluorescence), knr is the rate constant for all non-radiative relaxation processes. Non-radiative processes are excited state decay mechanisms ...
In particle physics, quantum electrodynamics ( QED) is the relativistic quantum field theory of electrodynamics. [1] [2] [3] In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved. [2] QED mathematically describes all phenomena involving electrically charged particles interacting by means ...
