1. Department of Chemistry, University of Illinois at Springfield, Springfield, Illinois 62703, United States
2. Department of Physics, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
3. Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
4. Department of Chemistry, Mary Baldwin College, Staunton, Virginia 24401, United States
5. North Carolina School of Science and Mathematics, Durham, North Carolina 27705, United States
6. Chemistry Department, Spokane Falls Community College, Spokane, Washington 99224, United States