1 Department of Chemical and Biomolecular Engineering , University of California , 201 Gilman Hall , Berkeley , California 94720 , USA . Email: berend.smit@epfl.ch.
2 Department of Chemistry , Norwegian University of Science and Technology , Høgskoleringen 5 , 7491 Trondheim , Norway.
3 Department of Chemistry , Chemical Theory Center and Supercomputing Institute , University of Minnesota , Minneapolis , Minnesota 55455-0431 , USA . Email: gagliard@umn.edu.
4 Molecular Foundry , Lawrence Berkeley National Laboratory , One Cyclotron Road , Berkeley , California 94720 , USA.
5 Department of Physics , University of California , Berkeley , USA.
6 Kavli Energy NanoSciences Institute at Berkeley , Berkeley , CA , USA.
7 Institut des Sciences et Ingénierie Chimiques, Valais , Ecole Polytechnique Fédérale de Lausanne (EPFL) , Rue de l'Industrie 17 , CH-1950 Sion , Switzerland.