1. The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3TA, United Kingdom
2. Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
3. Saint-Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
4. Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin, Germany
5. Sorbonne Université, CNRS, Laboratoire de Chimie Physique—Matière et Rayonnement, LCPMR, F-75005 Paris, France
6. LIDYL, CEA, CNRS, Université Paris-Saclay, CEA-Saclay, 91191 Gif-sur-Yvette, France
7. The Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3QZ, United Kingdom
8. Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, United Kingdom
9. Department of Physics, Lund University, 22100 Lund, Sweden
10. Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
11. Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
12. Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
13. Department of Chemistry, Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
14. Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden
15. European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
16. J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
17. Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
18. Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
19. Institute of X-ray Physics, University of Göttingen, 37077 Göttingen, Germany
20. Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom