1. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Institute for Experimental Molecular Imaging (ExMI), RWTH Aachen University Hospital, Forckenbeckstr. 55, Aachen, 52074, Germany
3. Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
4. National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. Department of Nuclear Engineering, University of California, Berkeley, Berkeley, California 94720, United States
6. Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States