1. Department of Polymer Chemistry Institute of Chemistry Chemnitz University of Technology Straße der Nationen 62 09111 Chemnitz Germany
2. Spectroscopy/Imaging Leibniz Institute of Photonic Technology Albert-Einstein-Str. 9 Jena Germany
3. Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University Helmholtzweg 4 07743 Jena Germany