1. Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
2. Department of Physics, North Carolina A&T State University, Greensboro, North Carolina 27411, USA
3. Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
4. Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA
5. Department of Theoretical Physics, University of Debrecen, H-4010 Debrecen, Hungary