1. Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
2. Max-Planck-EPFL Center for Molecular Nanoscience and Technology, Institute of Chemical Sciences and Engineering (ISIC), Station 6, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
3. Institute for Physical Chemistry, Georg-August University of Göttingen, 37077 Göttingen, Germany
4. International Center for Advanced Studies of Energy Conversion, Georg-August University of Göttingen, 37077 Göttingen, Germany