1. Department of Physics, UC Berkeley, Berkeley, California 94720, USA
2. Department of Chemical Engineering and Biotechnology, Cambridge University, Cambridge, United Kingdom
3. Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
4. College of Chemistry, UC Berkeley, Berkeley, California 94720, USA
5. Helmholtz Institut Mainz, 55099 Mainz, Germany
6. RWTH Aachen, Aachen, Germany
7. Institute of Physics, Jagiellonian University, 30-348 Kraków, Poland
8. Nuclear Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
9. Helmholtz Institut Mainz, Johannes Gutenberg Universität, Mainz, Germany