1. Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
2. Department of Physics, University of Dhaka, Dhaka 1000, Bangladesh
3. Department of Chemistry, Wright State University, 3640 Colonel Glenn Hwy, Dayton, Ohio 45435, United States
4. Department of Chemistry, University of Rochester, Rochester, New York 14627, United States