1. Department
of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849-5312, United States
2. Center
for Computational Molecular Science and Techology, School of Chemistry
and Biochemistry and School of Computational Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
3. Department
of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118-5645, United States