1. Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, United States
2. Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
3. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China