1. University of Basel, Department of Physics, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
2. University of Basel, Centre of Microscopy, Klingelbergstrasse 50/70, CH-4056, Basel, Switzerland
3. University of Applied Sciences Northwestern Switzerland (FHNW), Institute of Product and Production Engineering, Klosterzelgstrasse 2, CH-5210 Windisch, Switzerland
4. CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France