出典:Wiktionary
出典:『Wiktionary』 (2009/07/01 18:13 UTC 版)
selection rule (複数形 selection rules)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/20 16:13 UTC 版)
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.