Institution: | (1) Chemical Physics Theory Group, Department of Chemistry, University of Toronto, Toronto, ON, M5S 3H6, Canada;(2) Department of Physics and Centre for Scientific Computation, Trinity College, Dublin 2, Ireland;(3) INFM and Dipartimento di Fisica, Università La Sapienza , Piazzale Aldo Moro, 2, 00185 Rome, Italy |