1. Department of Chemistry, San José State University, 1 Washington Square, San José, California 95192, United States
2. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sandhill Road, Menlo Park, California 94025, United States
3. Department of Physics, Stanford University, 382 Via Pueblo Mall, Palo Alto, California 94025, United States
4. The Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
5. Microelectronics Research Unit, University of Oulu, Pentti Kaiteran katu 1, Linnanmaa, P.O. Box 4500, Oulu 90014, Finland