1. Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, Nevada 89154, USA
2. Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
3. Chemical Physics Theory Group, Department of Chemistry and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario M5S 3H6, Canada
4. Theoretical Division (T-1, MS B221), Los Alamos National Laboratory, Los Alamos, NM 87545, USA