a Institute for Molecular Physics, Free University of Berlin, D-1000 Berlin 33, West Germany
b Ciba-Geigy Ltd., R-1062.302, CH-4002 Basel, Switzerland
Abstract:
The ketone ω,ω-dimethoxy-ω-phenyl-acetophenone (DMPA) is an efficient initiator in UV-curing polymerization processes started by photochemically generated radicals. The short-lived radical intermediates created during the photolysis of DMPA have been investigated by time-resolved ESR and ENDOR spectroscopy taking advantage of a strong CIDEP effect.