1. Department of Physics, Atmospheric Sciences and Geoscience, Jackson State University, 1400 J. R. Lynch Street, P.O. Box 17660, Jackson, Mississippi 39217, United States
2. Department of Physics and Astronomy, East Tennessee State University, Johnson City, Tennessee 37614, United States
3. Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217, United States