1. Center for Nanophase Materials Sciences Division and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
2. Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202, USA
3. Computational Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, USA
4. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
5. Quantum Simulations Group, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA
6. Department of Chemistry, University of California, Berkeley, California 94720, USA
7. Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
8. Computational Physics Laboratory, Tampere University, P.O. Box 692, 33014 Tampere, Finland
9. Department of Chemistry, Columbia University, New York, New York 10027, USA
10. Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
11. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
12. Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
13. Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA
14. Laboratory for Laser Energetics, University of Rochester, 250 E River Rd., Rochester, New York 14623, USA
15. Department of Chemistry, University of Washington, Seattle, Washington 98195, USA