1. Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt am Main, Germany
2. Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
3. Laboratoire de Chimie Physique Matière et Rayonnement, UMR 7614, Sorbonne Université, CNRS, 75005 Paris, France
4. Lawrence Berkeley National Laboratory, Chemical Sciences Division, Berkeley, California 94720, USA
5. Department of Physics, University of Nevada, Reno, Nevada 89557, USA
6. Department of Physics, Auburn University, Auburn, Alabama 36849, USA
7. J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
8. Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, 69120 Heidelberg, Germany
9. European XFEL GmbH, 22869 Schenefeld, Germany