1. Department of Chemistry, University of Zurich, Zurich, 8057, Switzerland
2. Department of Physics, University of Zurich, Zurich, 8057, Switzerland
3. Swiss Light Source, Paul Scherrer Institute, Villigen, 5232, Switzerland
4. Surface Science and Coating Technologies Laboratory/Transport at Nanoscale Interfaces Laboratory, Swiss Federal Laboratories for Materials Science and Technology (EMPA), Dübendorf, 8600, Switzerland