1. Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
2. Theoretical Physics and Chemistry of Materials, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
3. Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States