1. Institute
for Theoretical Chemistry, Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
2. Department
of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
3. Institut
für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
4. Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
5. Computation
Institute, The University of Chicago, Chicago, Illinois 60637, United States
6. Department
of Chemistry, University of Utah, 315 S. 1400 E. Room 2020, Salt Lake City, Utah 84112, United States