[1] Coll Charleston, Dept Phys & Astron, Charleston, SC 29424 USA
[2] Coll Charleston, Dept Chem & Biochem, Charleston, SC 29424 USA
[3] Univ South Carolina, Dept Mech Engn, Columbia, SC 29208 USA
[4] City Univ New York, Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA
[5] Charleston Southern Univ, Dept Phys Sci, Charleston, SC 29485 USA