Marcus inverted region (for electron transfer)

https://doi.org/10.1351/goldbook.M03704
See: inverted region
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2253 (https://doi.org/10.1351/pac199668122223)