1. SLAC National Accelerator Laboratory, Menlo Park, CA, USA.
2. Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.
3. Department of Chemistry, Stanford University, Stanford, CA, USA.
4. Department of Physics and Astronomy, University of Nebraska–Lincoln, Lincoln, NE, USA.
5. Biophysics Program, Stanford University, Stanford, CA, USA.
6. Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany.
7. Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA.