1. Department
of Physics, AlbaNova University Center, Stockholm University, S-10691 Stockholm, Sweden
2. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
3. LNESS
Laboratory and Dipartimento di Fisica, Politecnico di Milano, Via Anzani
42, 22100 Como, Italy
4. Istituto Nazionale di Fisica Nucleare, via Celoria 16, 20133 Milano, Italy
5. SUNCAT
Center for Interface Science and Catalysis, Department of Chemical
Engineering, Stanford University, 443 Via Ortega, Stanford, California 95305, United States
6. Stanford
Nano Shared Facilities, Stanford University, 348 Via Pueblo, Stanford, California 94305, United States
7. Center
for Electron Nanoscopy, Technical University of Denmark, Fysikvej
307, 2800 Kgs. Lyngby, Denmark