1. Department of Chemistry, University of California, Berkeley, CA 94720, USA.
2. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3. The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
4. Theory Institute for Materials and Energy Spectroscopies, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
5. Department of Physics, University of California, Berkeley, CA 94720, USA.