1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
2. Translational Imaging Center, University of Southern California, Los Angeles, California 90089, USA
3. Technology and Applications Center (TAC), Newport Corporation, Irvine, California 92606, USA
4. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA