In physics and chemistry a selection rule, or transition rule, formally constrains the possible transitions of a system from one state to another. Selection rules have been derived for electronic, vibrational, and rotational transitions. The selection rules may differ according to the technique used to observe the transition.
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Famous quotes containing the words selection and/or rule:
“Historians will have to face the fact that natural selection determined the evolution of cultures in the same manner as it did that of species.”
—Konrad Lorenz (1903–1989)
“Some rule out of a lust for ruling; others, so as not to be ruled:Mto these it is merely the lesser of two evils.”
—Friedrich Nietzsche (1844–1900)