Excitation mechanisms of C II optical permitted lines in ionized nebulae E. Reyes-Rodríguez, J. E. Méndez-Delgado, J. García-Rojas, L. Binette, A. Nemer, C. Esteban and K. Kreckel A&A, 687 (2024) A97 Published online: 02 July 2024 DOI: 10.1051/0004-6361/202348820