1. Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, P.O.
Box 1033, Blindern, N-0315, Oslo, Norway
2. Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
3. Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
4. Institut Charles Gerhardt, UMR 5253 CNRS-UM-ENSCM, cc 1501 Université de Montpellier, Montpellier 34095, France
5. Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
6. Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States