1. Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, United States
2. Laboratoire de Chimie et Physique Quantiques, CNRS, Université Toulouse III, 118 route de Narbonne, 31062 Toulouse, France
3. Hylleraas Center for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, Oslo 0371, Norway