1. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
2. Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada
3. European XFEL, GmbH, Holzkoppel 14, 22869 Schenefeld, Germany
4. Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
5. J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
6. Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
7. School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom
8. Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
9. Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, United Kingdom