1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
2. Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
3. Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
4. Oden Institute for Computational Engineering & Sciences, University of Texas at Austin, Austin, Texas 78712, United States
5. Theoretical Division T-1, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
6. Department of Physics & Astronomy, Clemson University, Clemson, South Carolina 29631, United States