1. Freie Universität BerlinInstitute of Chemistry and Biochemistry Takustraße 3 14195 Berlin Germany
2. Freie Universität Berlin Institute of Chemistry and BiochemistryResearch Center of Electron Microscopy 14195 Berlin Germany
3. Fritz Haber Institute of the Max Planck SocietyDepartment of Molecular Physics Faradayweg 4–6 Berlin Germany