Forbidden mechanism

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Forbidden mechanism”, under the CC BY-SA 4.0 license. Read the article on Wikipedia