1. Interdisciplinary Research Group “Time-Resolved Spectroscopy”, Faculty of Chemistry and Mineralogy, University of Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany, Department of Physical Chemistry, Ruder Bošković Institute, Bijenička c. 54, HR-10 000 Zagreb, Croatia, and Leibniz-Institute of Surface Modification, Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany