1. Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
2. LCLS and Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
3. SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
4. Department of Chemistry, University of Washington, Seattle, Washington 98195, USA
5. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA