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Forbidden mechanism

In spectroscopy, a forbidden mechanism (forbidden transition or forbidden line) is a spectral line associated with absorption or emission of photons by atomic nuclei, atoms, or molecules which undergo a transition that is not allowed by a particular selection rule but is allowed if the approximation associated with that rule is not made. For example, in…

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In radioactive decay

In solid-state physics

In astrophysics and atomic physics

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Forbidden mechanism

Nodes62
Edges61
Triples5
Avg. degree1.97
Density0.032258
Components1

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Important terminology

forbidden decay transitions spin state transition allowed excited gamma emission unit beta atomic change selection angular momentum emitted states atoms

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
erbiuminstance ofForbidden transitions in rare earth atoms0.80text
neodymium make them useful as dopants for solid-state lasing mediainstance ofForbidden transitions in rare earth atoms0.80text
electron beam ion trapsinstance ofsoft x-ray and x-ray photons are routinely observed in certain laboratory devices0.80text
ion storage ringsinstance ofsoft x-ray and x-ray photons are routinely observed in certain laboratory devices0.80text
where in both cases residual gas densities are sufficiently low for forbidden line emission to occur before atoms are collisionally de-excitedinstance ofsoft x-ray and x-ray photons are routinely observed in certain laboratory devices0.80text

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