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:
“Every writer is necessarily a critic—that is, each sentence is a skeleton accompanied by enormous activity of rejection; and each selection is governed by general principles concerning truth, force, beauty, and so on.... The critic that is in every fabulist is like the iceberg—nine-tenths of him is under water.”
—Thornton Wilder (1897–1975)
“All you people don’t know about lost causes. Mr. Paine does. He said once they were the only causes worth fighting for, and he fought for them once, for the only reason that any man ever fights for them. Because of just one plain, simple rule—Love Thy Neighbor. And in this world today, full of hatred, a man who knows that one rule has a great trust.”
—Sidney Buchman (1902–1975)