1. Walter Schottky Institut and Physik-Department
2. Technische Universität München
3. 85748 Garching
4. Germany
5. Department of Physics and I3N
6. University of Aveiro
7. 3810-193 Aveiro
8. Portugal
9. Institute for Combustion and Gasdynamics – Reactive Fluids – and CENIDE
10. Center for Nanointegration Duisburg-Essen
11. Universität Duisburg-Essen
12. 47057 Duisburg