1. Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
2. Department
of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
3. Max Planck Institute for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
4. Department
of Chemistry, University of Göttingen, 37077 Göttingen, Germany