| 单词 | coupling |
| 释义 | coupling 1(in physics) An interaction between two different parts of a system or between two or more systems. Examples of coupling in the spectra of atoms and nuclei are Russell-Saunders coupling, j-j coupling, and spin-orbit coupling. In the spectra of molecules there are five idealized ways (called the Hund coupling cases ) in which the different types of angular momentum in a molecule (the electron orbital angular momentum L, the electron spin angular momentum S, and the angular momentum of nuclear rotation N) couple to form a resultant angular momentum J. (In practice, the coupling for many molecules is intermediate between Hund's cases due to interactions, which are ignored in the idealized cases.) In solid-state physics an example of coupling is electron-phonon coupling, the analysis of which gives the theories of electrical conductivity and superconductivity. See also coupling constant. 2(in chemistry) A type of chemical reaction in which two molecules join together; for example, the formation of an azo compound by coupling of a diazonium ion with a benzene ring. |
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