1. Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China, Laboratoire de Chimie Théorique, Université Pierre & Marie Curie, Paris 6, CNRS, UMR7616, Case 137, 4 place Jussieu, Paris, F-75252 Cedex France, Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany, Department of Chemistry, Indiana University, Bloomington, Indiana 47405, Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong...