1. Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden
2. European XFEL, Holzkoppel 4, DE-22869 Schenefeld, Germany
3. Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
4. Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron, Notkestraße 85, DE-22607 Hamburg, Germany