n → σ* transition

An electronic transition described approximately as @P04877@ of an electron from a 'non-bonding' (lone-pair) n orbital to an 'antibonding' σ orbital designated as σ*. Such transitions generally involve high transition energies and appear close to or mixed with @R05432@.
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2255 [Terms] [Paper]