Quantum modeling of the optical spectra of carbon cluster structural families and relation to the interstellar extinction UV bumpC. Dubosq, F. Calvo, M. Rapacioli, E. Dartois, T. Pino, C. Falvo and A. SimonA&A, 634 (2020) A62DOI: https://doi.org/10.1051/0004-6361/201937090