- forbidden transitions
- запрещенные переходы (спектра)
English-russian astronautics dictionary. - M.: Military Publishing house. Compiled by F. P. Suprun, K. V. Shirokov. 1964.
forbidden transitions
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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 lines — ▪ physics in astronomical spectroscopy, bright emission lines in the spectra of certain nebulae (H II regions (H II region)), not observed in the laboratory spectra of the same gases, because on Earth the gases cannot be rarefied… … Universalium
spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… … Universalium
Selection rule — In physics and chemistry, especially in the context of quantum mechanics, a selection rule is a condition constraining the physical properties of the initial system and the final system that is necessary for a process to occur with a nonzero… … Wikipedia
luminescence — luminescent, adj. /looh meuh nes euhns/, n. 1. the emission of light not caused by incandescence and occurring at a temperature below that of incandescent bodies. 2. the light produced by such an emission. [1885 90; < L lumin (see LUMEN) +… … Universalium
Hot band — In molecular vibrational spectroscopy, a hot band (or hot transition) is a transition between two states of a single normal mode of vibration, neither of which is the overall ground state.[1] In infrared or Raman spectroscopy, hot bands refer to… … Wikipedia
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
transition — transitional, transitionary /tran zish euh ner ee, sish /, adj. transitionally, adv. /tran zish euhn, sish /, n. 1. movement, passage, or change from one position, state, stage, subject, concept, etc., to another; change: the transition from… … Universalium
Population inversion — In physics, specifically statistical mechanics, a population inversion occurs when a system (such as a group of atoms or molecules) exists in state with more members in an excited state than in lower energy states. The concept is of fundamental… … Wikipedia
Electron energy loss spectroscopy — In electron energy loss spectroscopy (EELS) a material is exposed to a beam of electrons with a known, narrow range of kinetic energies. Some of the electrons will undergo inelastic scattering, which means that they lose energy and have their… … Wikipedia
Phosphorescence — As these transitions occur less often in certain materials, absorbed radiation may be re emitted at a lower intensity for up to several hours.The study of phosphorescent materials led to the discovery of radioactivity in 1896. Explanations of the … Wikipedia
