parity selection rules

parity selection rules

[′par·əd·ē si′lek·shən ‚rülz]
(quantum mechanics)
Rules which specify whether or not a change in parity occurs during a given type of transition of an atom, molecule, or nucleus; for example, the Laporte selection rule, or the rule that there is no parity change in an allowed β-decay transition of a nucleus.
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