state crossing

https://doi.org/10.1351/goldbook.S05940
See: avoided crossing (of potential-energy surfaces), surface crossing
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2277 (https://doi.org/10.1351/pac199668122223)