1. Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
3. Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, West Virginia 26505, United States
4. Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
5. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
6. Department of Physics, Kenyatta University, P.O. Box 43844-0100, Nairobi, Kenya
7. Department of Chemical Engineering, Malawi University of Science and Technology, P.O. Box 5196, Limbe, Blantyre, Malawi
8. Department of Physics, University of Dar es Salaam, P.O. Box 35091, Dar es Salaam, Tanzania
9. Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States