1. Group of Electron Microscopy
of Materials Science, Central Facility for Electron Microscopy, Ulm University, Albert Einstein Allee 11, Ulm 89081,
Germany
2. School of Chemistry, University of Nottingham, University Park, Nottingham
NG7 2RD, United Kingdom
3. Carl Zeiss NTS GmbH, Carl-Zeiss-Strasse 56, 73447 Oberkochen,
Germany