1. Institute of Chemistry, Chair of Macromolecular Chemistry, Faculty
of Natural Science II (Chemistry, Physics and Mathematics), Martin-Luther University Halle-Wittenberg, Halle (Saale)
D-06120, Germany
2. Institute
of Physics, Faculty of Natural Science II (Chemistry, Physics and
Mathematics), Martin-Luther University Halle-Wittenberg, Halle (Saale) D-06120, Germany