Xiaochun Gong^1,6, Daniel Hammerland¹, Meng Han^1,7, Saijoscha Heck¹, Matthias Hoffmann², Andrei Kamalov², Kirk A. Larsen^2,3, Xiang Li², Ming-Fu Lin², Yuchen Liu^8,9, C. William McCurdy^8,9, Razib Obaid², Jordan T. O’Neal³, Thomas N. Rescigno⁸, River R. Robles^2,3, Nicholas Sudar^2,3, Peter Walter², Anna L. Wang^2,3, Jun Wang^2,3, Thomas J. A. Wolf^2,3, Zhen Zhang², Kiyoshi Ueda^1,10,11, Robert R. Lucchese^8,†, Agostino Marinelli^2,3,‡, James P. Cryan^2,3,§, and Hans Jakob Wörner^1,∥

• ¹Laboratory of Physical Chemistry, ETH Zürich, Zurich, Switzerland
• ²SLAC National Accelerator Laboratory, Menlo Park, California, USA
• ³Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California, USA
• ⁴Laboratory for Ultrafast X-ray Sciences, EPFL, Lausanne, Switzerland
• ⁵Cal Poly Maritime Academy, Vallejo, California, USA
• ⁶State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, China
• ⁷J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas, USA
• ⁸Lawrence Berkeley National Laboratory, Berkeley, California, USA
• ⁹Department of Chemistry, University of California, Davis, California, USA
• ¹⁰Department of Chemistry, Tohoku University, Sendai, Japan
• ¹¹School of Physical Science and Technology, ShanghaiTech University, Shanghai, China

• ^*These authors contributed equally to this work.
• ^†Contact author: rlucchese@lbl.gov
• ^‡Contact author: marinelli@slac.stanford.edu
• ^§Contact author: jcryan@stanford.edu
• ^∥Contact author: hwoerner@ethz.ch