Definition for selection rule - Oxford Dictionaries Online (World English)

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	selection rule (se¦lec\|tion rule) noun Physics a rule which describes whether particular quantum transitions in an atom or molecule are allowed or forbidden.		More words in this category attenuate baryon D 2 electrostatic units electroweak equipartition incident infrasound ionizing radiation lepton 2 phase polygon of forces power ripple Rydberg atom sawtooth tachyon transition Nearby Words selaginella selah Selangor seldom select select committee selectee selection selection pressure selection rule selectional selective selective attention selective service selectivity selectman selector selenate Selene