1School of Mathematical and Natural Sciences, University of Arkansas at Monticello, Monticello, AR 71656, USA
2Department of Physics, Wake Forest University, Winston Salem, NC27109, USA
*Corresponding Author:
Jinming Huang, Associate Professor of Chemistry, School of Mathematical and Natural Sciences, University of Arkansas at Monticello, Monticello, AR 71656, USA, Tel: 1-870-460-1866, Fax: 870-460-1316