1. Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, United States
2. Applied Research Laboratories, University of Texas at Austin, Austin, Texas 78758, United States
3. Department of Physics, University of Punjab, 05422 Lahore, Pakistan
4. Department of Chemistry, New York University, New York New York 10003, United States
5. Courant Institute of Mathematical Sciences, New York University, New York New York 10012, United States
6. NYU-ECNU Center for Computational Chemistry at NYU Shanghai, 3663 Zhongshan Road North, Shanghai 200062, China