1. Synthèse et ElectroSynthèse Organiques (CNRS, UMR 6510), Université de Rennes 1, Campus de Beaulieu, Bât 10A Case 1003, F-35042 Rennes Cedex, France, Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, U.K., Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, and Los Alamos National Laboratory, Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos, New Mexico 87545