1. Department of Materials Science and Engineering; Stanford University; Stanford CA 94305 USA
2. Department of Chemistry; University of California; Berkeley CA 94720 USA
3. Physical Sciences and Engineering Division; King Abdullah University of Science and Technology; Thuwal 23955-6900 Saudi Arabia
4. Stanford Synchrotron Radiation Lightsource; SLAC National Accelerator Laboratory; Menlo Park CA 94025 USA