1. Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, Department of Physical Chemistry and the Fritz Haber Center for Molecular Dynamics, Hebrew University of Jerusalem, 91904 Israel, Department of Chemistry, University of California, Irvine, California 92697, Institute of Physics, National Academy of Sciences of Belarus, Skaryna Ave. 70, 220602 Minsk, Belarus, Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany, and...