1. Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
2. Department of Energy Conversion and Storage, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
3. Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
4. Ultrafast Electron Microscopy Laboratory, The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071, China
5. European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany