1. Department of Chemistry and Quantum Theory Project, University of Florida, Gainesville, Florida 32603, United States
2. Department of Chemistry, University of Florida, Gainesville, Florida 32603, United States
3. Department of Applied Mathematics, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
4. Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany