1. Institute of Physical ChemistryUniversity of Göttingen Tammannstr. 6 Göttingen D‐37077 Germany
2. Institute of Organic and Biomolecular ChemistryUniversity of Göttingen Tammannstr. 2 Göttingen D‐37077 Germany
3. Institute of Physical ChemistryUniversity of GöttingenTechnical and Macromolecular Chemistry Section Tammannstr. 6 Göttingen D‐37077 Germany