1. SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park 94025, California, United States
2. SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford 94305, California, United States
3. Department of Physics, Technical University of Denmark, Kongens Lyngby DK-2800, Denmark