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- Forbidden_mechanism abstract "In physics, a forbidden mechanism or forbidden line is a spectral line emitted by atomic nuclei, atoms, or molecules undergoing nominally \"forbidden\" energy transitions not normally \"allowed\" by the selection rules of quantum mechanics. Obviously, any process which is truly forbidden will not happen. The typical usage of this term, is in a situation where, according to usual approximations (such as the electric-dipole approximation for the interaction with light), the process cannot happen, but at a higher level of approximation (e.g. magnetic dipole, or, electric quadrupole) the process is allowed but at a much lower rate.A simple everyday example is \"glow in the dark\" materials. They absorb light and form an excited state whose decay involves a spin flip, and is therefore forbidden by electric dipole transitions. The result is emission of light slowly over minutes or hours. This process is known technically as phosphorescence.Although the transitions are nominally \"forbidden\", there is a small probability of their spontaneous occurrence, should an atomic nucleus, atom or molecule be raised to an excited state. More precisely, there is a certain probability that such an excited entity will make a forbidden transition to a lower energy state per unit time; by definition, this probability is much lower than that for any transition permitted or allowed by the selection rules. Therefore, if a state can de-excite via a “permitted” transition (or otherwise, e.g. via collisions) it will almost certainly do so before any transition occurs via a “forbidden” route. Nevertheless, most “forbidden” transitions are only relatively unlikely: states that can only decay in this way (so-called meta-stable states) usually have lifetimes on the order milliseconds to seconds, compared to less than a microsecond for decay via permitted transitions. In some radioactive decay systems, multiple levels of “forbiddenness” can stretch life times by many orders of magnitude for each additional unit by which the system changes beyond what is most allowed under the selection rules. Such excited states can last years, or even for many billions of years (too long to have been measured).".
- Forbidden_mechanism wikiPageID "3439285".
- Forbidden_mechanism wikiPageLength "9683".
- Forbidden_mechanism wikiPageOutDegree "50".
- Forbidden_mechanism wikiPageRevisionID "698911995".
- Forbidden_mechanism wikiPageWikiLink 1989_in_literature.
- Forbidden_mechanism wikiPageWikiLink Angular_momentum.
- Forbidden_mechanism wikiPageWikiLink Angular_momentum_operator.
- Forbidden_mechanism wikiPageWikiLink Atom.
- Forbidden_mechanism wikiPageWikiLink Atomic_nucleus.
- Forbidden_mechanism wikiPageWikiLink Beta_decay.
- Forbidden_mechanism wikiPageWikiLink Category:Astronomical_spectroscopy.
- Forbidden_mechanism wikiPageWikiLink Category:Quantum_chemistry.
- Forbidden_mechanism wikiPageWikiLink Category:Spectroscopy.
- Forbidden_mechanism wikiPageWikiLink Collision.
- Forbidden_mechanism wikiPageWikiLink Cubic_centimetre.
- Forbidden_mechanism wikiPageWikiLink Density.
- Forbidden_mechanism wikiPageWikiLink Donald_Edward_Osterbrock.
- Forbidden_mechanism wikiPageWikiLink Earth.
- Forbidden_mechanism wikiPageWikiLink Electric_dipole_moment.
- Forbidden_mechanism wikiPageWikiLink Energy_economics.
- Forbidden_mechanism wikiPageWikiLink Erbium.
- Forbidden_mechanism wikiPageWikiLink H_II_region.
- Forbidden_mechanism wikiPageWikiLink Hydrogen_line.
- Forbidden_mechanism wikiPageWikiLink Internal_conversion.
- Forbidden_mechanism wikiPageWikiLink Magnetic_moment.
- Forbidden_mechanism wikiPageWikiLink Metastability.
- Forbidden_mechanism wikiPageWikiLink Molecule.
- Forbidden_mechanism wikiPageWikiLink Nanometre.
- Forbidden_mechanism wikiPageWikiLink Near_space.
- Forbidden_mechanism wikiPageWikiLink Neodymium.
- Forbidden_mechanism wikiPageWikiLink Nitrogen.
- Forbidden_mechanism wikiPageWikiLink Nuclear_isomer.
- Forbidden_mechanism wikiPageWikiLink Outer_space.
- Forbidden_mechanism wikiPageWikiLink Oxygen.
- Forbidden_mechanism wikiPageWikiLink Parity_(physics).
- Forbidden_mechanism wikiPageWikiLink Phosphorescence.
- Forbidden_mechanism wikiPageWikiLink Physics.
- Forbidden_mechanism wikiPageWikiLink Planetary_nebula.
- Forbidden_mechanism wikiPageWikiLink Plasma_(physics).
- Forbidden_mechanism wikiPageWikiLink Quadrupole.
- Forbidden_mechanism wikiPageWikiLink Quantum_mechanics.
- Forbidden_mechanism wikiPageWikiLink Selection_rule.
- Forbidden_mechanism wikiPageWikiLink Semiconductor.
- Forbidden_mechanism wikiPageWikiLink Solid-state_laser.
- Forbidden_mechanism wikiPageWikiLink Spectral_line.
- Forbidden_mechanism wikiPageWikiLink Spin_(physics).
- Forbidden_mechanism wikiPageWikiLink Sulfur.
- Forbidden_mechanism wikiPageWikiLink Tauc_plot.
- Forbidden_mechanism wikiPageWikiLink Vacuum.
- Forbidden_mechanism wikiPageWikiLinkText ""Forbidden" emission lines".
- Forbidden_mechanism wikiPageWikiLinkText ""forbidden" transitions".
- Forbidden_mechanism wikiPageWikiLinkText ""forbidden"".
- Forbidden_mechanism wikiPageWikiLinkText "Forbidden lines".
- Forbidden_mechanism wikiPageWikiLinkText "Forbidden mechanism".
- Forbidden_mechanism wikiPageWikiLinkText "Forbidden".
- Forbidden_mechanism wikiPageWikiLinkText "dipole-forbidden".
- Forbidden_mechanism wikiPageWikiLinkText "forbidden lines".
- Forbidden_mechanism wikiPageWikiLinkText "forbidden mechanism".
- Forbidden_mechanism wikiPageWikiLinkText "forbidden transition".
- Forbidden_mechanism wikiPageWikiLinkText "forbidden".
- Forbidden_mechanism wikiPageWikiLinkText "permitted".
- Forbidden_mechanism wikiPageWikiLinkText "quantum-mechanically forbidden".
- Forbidden_mechanism wikiPageUsesTemplate Template:Fact.
- Forbidden_mechanism wikiPageUsesTemplate Template:Math.
- Forbidden_mechanism wikiPageUsesTemplate Template:Molecules_detected_in_outer_space.
- Forbidden_mechanism wikiPageUsesTemplate Template:More_footnotes.
- Forbidden_mechanism wikiPageUsesTemplate Template:Multiple_issues.
- Forbidden_mechanism wikiPageUsesTemplate Template:Mvar.
- Forbidden_mechanism wikiPageUsesTemplate Template:One_source.
- Forbidden_mechanism wikiPageUsesTemplate Template:Reflist.
- Forbidden_mechanism subject Category:Astronomical_spectroscopy.
- Forbidden_mechanism subject Category:Quantum_chemistry.
- Forbidden_mechanism subject Category:Spectroscopy.
- Forbidden_mechanism hypernym Line.
- Forbidden_mechanism type Astrophysic.
- Forbidden_mechanism type Mechanic.
- Forbidden_mechanism type Physic.
- Forbidden_mechanism type Redirect.
- Forbidden_mechanism type Technique.
- Forbidden_mechanism comment "In physics, a forbidden mechanism or forbidden line is a spectral line emitted by atomic nuclei, atoms, or molecules undergoing nominally \"forbidden\" energy transitions not normally \"allowed\" by the selection rules of quantum mechanics. Obviously, any process which is truly forbidden will not happen.".
- Forbidden_mechanism label "Forbidden mechanism".
- Forbidden_mechanism sameAs Q932483.
- Forbidden_mechanism sameAs Línia_prohibida.
- Forbidden_mechanism sameAs Verbotener_Übergang.
- Forbidden_mechanism sameAs Línea_prohibida.
- Forbidden_mechanism sameAs Kielletyt_viivat.
- Forbidden_mechanism sameAs Raie_de_transition_interdite.
- Forbidden_mechanism sameAs Linea_proibita.
- Forbidden_mechanism sameAs 금지선.
- Forbidden_mechanism sameAs അദൃശ്യദീപ്തിരേഖകൾ.
- Forbidden_mechanism sameAs Linha_proibida.
- Forbidden_mechanism sameAs m.09cg95.
- Forbidden_mechanism sameAs Запрещённые_линии.
- Forbidden_mechanism sameAs Zakázaná_čiara.
- Forbidden_mechanism sameAs Q932483.
- Forbidden_mechanism sameAs 禁線.
- Forbidden_mechanism wasDerivedFrom Forbidden_mechanism?oldid=698911995.
- Forbidden_mechanism isPrimaryTopicOf Forbidden_mechanism.