The interplay of different relaxation channels in the excited state dynamics of photoinitiators
1 Institut für Physikalische Chemie, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
2 DFG Center for Functional Nanostructures (CFN), KIT
3 Institut für Angewandte Physik, KIT
4 Institut für Nanotechnologie, KIT
5 Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie, KIT
a e-mail: email@example.com
Different photoinitiators are investigated by femtosecond transient absorption spectroscopy and DFT calculations. Their initiation properties are critically governed by competition between intersystem crossing, fluorescence and internal conversion partly taking place on comparable time scales. It is thereby shown that the S* lifetime cannot serve as a measure for the photoinitiation efficiency.
© Owned by the authors, published by EDP Sciences, 2013
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