1. Fritz‐Haber‐Institut der Max‐Planck‐Gesellschaft Berlin Germany
2. Laboratoire de Spectroscopie Ultrarapide and Lausanne Centre for Ultrafast Science (LACUS) École polytechnique fédérale de Lausanne ISIC Lausanne Switzerland
3. Institut für Theoretische Physik Nichtlineare Optik und Quantenelektronik Technische Universität Berlin Berlin Germany
4. Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science Hamburg Germany
5. Département de Physique and Fribourg Center for Nanomaterials Université de Fribourg Fribourg Switzerland
6. Department of Applied Physics KTH Royal Institute of Technology Stockholm Sweden
7. SwissFEL Paul Scherrer Institute Villigen Switzerland
8. Department of Physics Chalmers University of Technology Gothenburg Sweden