1. Department of Chemistry, University of Chicago, Chicago, IL 60637, USA.
2. James Franck Institute, University of Chicago, Chicago, IL 60637, USA.
3. Northwestern University Center for Atom-Probe Tomography, Evanston, IL 60208, USA.
4. Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA.
5. Electron Microscopy Core, University of Illinois Chicago, Chicago, IL 60607, USA.
6. Keck Interdisciplinary Surface Science Center, Northwestern University, Evanston, IL 60208, USA.
7. Ben May Department for Cancer Research, University of Chicago, Chicago, IL 60637, USA.
8. Department of Physics, University of Chicago, Chicago, IL 60637, USA.
9. Institute for Biophysical Dynamics, University of Chicago, Chicago, IL 60637, USA.