The interplay of different relaxation channels in the excited state dynamics of photoinitiators T. J. A. Wolf, J. Fischer, D. Voll, M. Wegener, C. Barner-Kowollik and A.-N. Unterreiner EPJ Web of Conferences, 41 (2013) 05008 Published online: 13 March 2013 DOI: 10.1051/epjconf/20134105008