1. LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
2. Institut für Chemie, Technische Universität Berlin, 10623 Berlin, Germany
3. Institut de Chimie des Substances Naturelles (ICSN), CNRS UPR 2301, Université Paris-Saclay, 91198 Gif-sur-Yvette cedex, France
4. Department of Chemistry, University of California, Davis, California 95616, United States
5. SETI Institute, Mountain View, California 94043, United States
6. Precision Spectroscopy Division, SPring-8/JASRI, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
7. RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan