1. Physics Department, University of Concordia, Montreal, QC H4B 1R6, Canada
2. OpenEye Scientific Research, Santa Fe, New Mexico 87508, United States
3. Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Physical Chemistry and Applied Spectroscopy Group, Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States