1. Department of Inorganic Chemistry University of Chemistry and Technology Technicka 5 Prague 16628 Czech Republic
2. College of Engineering Mathematics and Physical Sciences University of Exeter Exeter EX4 4QF UK
3. Ernst Ruska‐Centre (ER‐C‐2) Forschungszentrum Jülich D‐52425 Jülich Germany
4. Jülich‐Aachen Research Alliance Fundamentals of Future Information Technology D‐52425 Jülich Germany