1. Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
2. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
3. Division of Chemical Physics, Department of Chemistry, Lund University, Box 124, SE-22100 Lund, Sweden
4. European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
5. Wigner Research Centre for Physics, Hungarian Academy Sciences, H-1525 Budapest, Hungary