1. Department of Physics and Astronomy,
COMSET, Clemson University, Clemson, South Carolina 29634, United
States
2. Department of Chemical
and Biological Engineering, Iowa State University, Ames, Iowa 50011,
United States
3. Department
of Chemistry, East Carolina University, Greenville, North Carolina
27858, United States
4. Department of Pharmacology & Toxicology, East Carolina University, Greenville, North Carolina 27834, United States