Exciton properties of selected aromatic hydrocarbon systems Friedrich Roth, Benjamin Mahns, Silke Hampel, Markus Nohr, Helmuth Berger, Bernd Büchner and Martin Knupfer Eur. Phys. J. B, 86 2 (2013) 66 Published online: 20 February 2013 DOI: 10.1140/epjb/e2012-30592-1