1. Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, United States
2. Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
3. Cell, Molecular, and Structural Biology Program, Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, United States
4. Department of Physics, Denison University, Granville, Ohio 43023, United States