1. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
2. Department of Natural Sciences and Mathematics, Dominican University of California, San Rafael, California 94901, USA
3. Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
4. Center for Computation and Technology, Louisiana State University, Baton Rouge, Louisiana 70803, USA
5. William R. Wiley Environmental Molecular Sciences Laboratory, Battelle, Pacific Northwest National Laboratory, Richland, Washington 99352, USA