forbidden symmetry

См. также в других словарях:

• symmetry — /sim i tree/, n., pl. symmetries. 1. the correspondence in size, form, and arrangement of parts on opposite sides of a plane, line, or point; regularity of form or arrangement in terms of like, reciprocal, or corresponding parts. 2. the proper or …   Universalium

• Symmetry — For other uses, see Symmetry (disambiguation) …   Wikipedia

• Forbidden mechanism — A forbidden mechanism or forbidden line is a concept in physics/chemistry. It is a spectral line emitted by atoms undergoing energy transitions not normally allowed by the selection rules of quantum mechanics. In chemistry, forbidden means… …   Wikipedia

• Forbidden City — a walled section of Peking, built in the 15th century, containing the imperial palace and other buildings of the imperial government of China. * * * Imperial Palace complex in Beijing, containing hundreds of buildings and some 9,000 rooms. It… …   Universalium

• Charge transfer complex — A charge transfer complex (or CT complex, electron donor acceptor complex) is a chemical association of two or more molecules, or of different parts of one very large molecule, in which the attraction between the molecules (or parts) is created… …   Wikipedia

• Charge-transfer complex — A charge transfer complex (CT complex) or electron donor acceptor complex is an association of two or more molecules, or of different parts of one very large molecule, in which a fraction of electronic charge is transferred between the molecular… …   Wikipedia

• quasicrystal — /kway zuy kris tl, kway suy , kwah see , zee /, n. a form of solid matter whose atoms are arranged like those of a crystal but assume patterns that do not exactly repeat themselves. [1985 90] * * * Introduction also called  quasi periodic crystal …   Universalium

• Chinese architecture — Diagram of corbel wood bracket supports ( Dougong ) holding up a multi inclined roof, from the architectural treatise Yingzao Fashi (1103 AD) Chinese architecture refers to a style of architecture that has taken shape in East Asia over many… …   Wikipedia

• Möbius–Hückel concept — The Möbius Hückel treatment is one of two predicting reaction allowedness versus forbiddeness. The concept is the counterpart of the Woodward Hoffmann approach. The methodology in this treatment utilizes the plus minus sign parity in proceeding… …   Wikipedia

• arts, East Asian — Introduction       music and visual and performing arts of China, Korea, and Japan. The literatures of these countries are covered in the articles Chinese literature, Korean literature, and Japanese literature.       Some studies of East Asia… …   Universalium

• Laporte rule — The Laporte rule is a spectroscopic selection rule named after Otto Laporte. [cite journal | author = Laporte, O. | coauthors = Meggers, W.F. | year = 1925 | title = Some rules of spectral structure | journal = Journal of the Optical Society of… …   Wikipedia