π – π* state

https://doi.org/10.1351/goldbook.P04385
An excited state related to the ground state by a π → π* transition.
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2266 (https://doi.org/10.1351/pac199668122223)