1. Department of Physics, Stanford University, Stanford, California 94305, USA
2. Department of Chemistry, Stanford University, Stanford, California 94305, USA
3. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
4. SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
5. National Institute of Standards and Technology, Boulder, Colorado 80305, USA
6. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
7. Department of Physics, Santa Clara University, Santa Clara, California 95053, USA