1. Stanford PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
2. Institute of Physics, University of Tartu, W. Ostwaldi 1, Tartu EE-50411, Estonia
3. Department of Chemistry, Lund University, Lund SE-22100, Sweden
4. Department of Physics, Stanford University, Stanford, California 94305, United States
5. SSRL, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States