1. Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
2. Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
3. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States