1. Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
2. Institute of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University in Toruń, ul. Grudziądzka 5, 87-100 Toruń, Poland
3. Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849-5312, USA
4. Quantum Theory Project, Departments of Chemistry and Physics, University of Florida, Gainesville, Florida 32611, USA