1. Department of Chemistry Stanford University Stanford CA 94305 USA
2. International Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
3. Institute of Physics University of Bayreuth 95440 Bayreuth Germany
4. Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
5. Department of Physics University of California Berkeley Berkeley CA 94720 USA
6. Kavli Energy NanoScience Institute at Berkeley Berkeley CA 94720 USA
7. Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park CA 94025 USA