1. Department of Astronomy, The Ohio State University, Columbus, Ohio 43210, Chemical Physics Program, The Ohio State University, Columbus, Ohio 43210, Department of Radiation Oncology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, Applied Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, High Performance Computing Group, ISL, IBM India, Bangalore 560 071, India, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210