1. Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52056 Aachen Germany
2. Jülich-Aachen Research Alliance (JARA-FIT and JARA-HPC); RWTH Aachen University; 52056 Aachen Germany
3. Institute of Physics IA; RWTH Aachen University; 52056 Aachen Germany