1. Institute
of Inorganic Chemistry, RWTH Aachen University and JARA-Fundamentals of Future Information Technology, Landoltweg 1, 52074 Aachen, Germany
2. Institute
of Physics (IA), RWTH Aachen University, Sommerfeldstraße 14, Turm 28, 52074 Aachen, Germany
3. Central
Facility for Electron Microscopy, RWTH Aachen University, Ahornstraße
55, 52074 Aachen, Germany
4. Institute
of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany