1. Department of Chemistry and The PULSE Institute, Stanford University, Stanford, California 94305, United States
2. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
3. Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, ON K1N 6N5, Canada
4. Department of Chemistry and Biomolecular Sciences, University of Ottawa, 150 Louis Pasteur, Ottawa, ON K1N 6N5, Canada
5. National Research Council Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6, Canada
6. Joint Centre for Extreme Photonics, NRC-University of Ottawa, Ottawa, ON K1A 0R6, Canada