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.
Read more about Selection Rule: Overview
Famous quotes containing the words selection and/or rule:
“When you consider the radiance, that it does not withhold
itself but pours its abundance without selection into every
nook and cranny”
—Archie Randolph Ammons (b. 1926)
“I make it a kind of pious rule to go to every funeral to which I am invited, both as I wish to pay a proper respect to the dead, unless their characters have been bad, and as I would wish to have the funeral of my own near relations or of myself well attended.”
—James Boswell (1740–1795)