1. The Hamburg Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany
2. Center for Free-Electron Laser Science (CFEL), Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
3. Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
4. Technical University of Denmark, Department of Chemical and Biochemical Engineering, Frederiksborgvej 399, 4000 Roskilde, Denmark
5. Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, United Kingdom