Selection rule

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

In physics and chemistry, a selection rule, or transition rule, formally constrains the possible transitions of a system from one quantum state to another. Selection rules have been derived for electromagnetic transitions in molecules, in atoms, in atomic nuclei, and so on.

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