1. Faculty of Science and Technology, Keio University, Yokohama, Japan
2. Institute of Nanotechnology
and
Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
3. Institute of Physical and Theoretical
Chemistry, Technical University Braunschweig, Braunschweig, Germany
4. Interdisciplinary Centre for
Electron Microscopy, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland