1. School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
2. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
3. Department of Chemistry, The University of Akron, Akron, OH 44325-3601, USA
4. Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
5. Nuclear and Radiological Engineering and Medical Physics Program, School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA