1. Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
2. Department of Physics, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan
3. Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
4. European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
5. Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
6. SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
7. J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
8. Lawrence Berkeley National Laboratory, Chemical Sciences Division, Berkeley, California 94720, USA
9. Department of Physics, University of Nevada, Reno, Nevada 89557, USA
10. RIKEN Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
11. Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
12. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
13. Department of Chemistry, Tohoku University, 6-3 Aramaki Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan