1. The Quantum Theory Project, Department of Chemistry, The University of Florida, Gainesville, Florida 32611, USA
2. Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA
3. Department of Chemistry, Ben-Gurion University of the Negev, Be’er-Sheva 8410501, Israel
4. Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA