1. Department of Chemistry & IRIS AdlershofHumboldt-Universität zu Berlin Brook-Taylor-Strasse 2 12489 Berlin Germany
2. Univ. Lille, CNRS, UMR 8516 – LASIR –Laboratoire de, Spectrochimie Infrarouge et Raman F-59000 Lille France
3. DWI—Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52074 Aachen Germany
4. Institute of Technical and Macromolecular ChemistryRWTH Aachen University Worringer Weg 2 52074 Aachen Germany