1. Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
2. Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary
3. Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409-1061, United States
4. Theoretical Division (T-1, MS B221), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States