1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
2. Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
3. Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
5. Department of Chemistry & Physics, Western Carolina University, Cullowhee, North Carolina 28723, United States