1. Kekulé-Institute of Organic Chemistry and Biochemistry
2. University of Bonn
3. D-53121 Bonn
4. Germany
5. Mulliken Center for Theoretical Chemistry
6. Institute of Physical und Theoretical Chemistry
7. D-53115 Bonn
8. Laboratoire de Chimie Physique
9. Université Paris-Sud
10. CNRS, Université Paris-Saclay
11. Orsay
12. France