Stark shift and dissociation process of an ionized donor bound exciton in spherical quantum dots F. Dujardin, E. Feddi, E. Assaid and A. Oukerroum Eur. Phys. J. B, 74 4 (2010) 507-516 Published online: 30 March 2010 DOI: 10.1140/epjb/e2010-00113-7