1. Walter Schottky Institute and Physics Department, Technische Universität München, Am Coulombwall 4, 85748 Garching bei München, Germany
2. Department of Chemistry, WACKER-Chair for Macromolecular Chemistry, Technische Universität München, Lichtenbergstraße 4, 85747 Garching bei München, Germany
3. Faculty of Physics, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany
4. Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany
5. Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
6. Department of Chemistry, University of Munich, LMU, Butenandtstraße 5-13, 81377 Munich, Germany
7. Cluster of Excellence E-conversion, Lichtenbergstraße 4a, 85748 Garching, Germany
8. Physics Department E20, Technische Universität München, James-Franck-Straße 1, 85748 Garching bei München, Germany
9. IOM CNR, Laboratorio TASC, AREA Science Park, Strada Statale 14 km 163.5, 34149 Basovizza, Trieste, Italy
10. Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
11. Elettra-Sincrotrone Trieste SCpA, AREA Science Park, Strada Statale 14 km 163.5, 34149, Trieste, Italy