1. Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, Bochum 44780, Germany
2. Department of Physics, Technische Universität (TU) Dortmund, Dortmund 44227, Germany
3. Department of Chemical Engineering, University of California, Santa Barbara, California 93106-5080, United States
4. Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, United States