Time-resolved measurements of electron transfer processes at the PTCDA/Ag(111) interface C. H. Schwalb, M. Marks, S. Sachs, A. Schöll, F. Reinert, E. Umbach and U. Höfer Eur. Phys. J. B, 75 1 (2010) 23-30 Published online: 24 March 2010 DOI: 10.1140/epjb/e2010-00106-6