1. Talladega College, Department of Physics, 627 West Battle Street, Talladega, Alabama 35610, United StatesbAlabama A&M University, Department of Physics, Chemistry, and Mathematics, 4900 Meridian Street, Normal, Alabama 35762, United States
2. Alabama A&M University, Department of Physics, Chemistry, and Mathematics, 4900 Meridian Street, Normal, Alabama 35762, United States
3. Ahmednagar College, Department of Chemistry, Station Road, Pune, Maharashtra 414001, India
4. NASA-Marshall Space Flight Center, Material Science Division, Redstone Arsenal, Huntsville, Alabama 35811, United States