1. Earth and Planets Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, USA
2. Department of Mathematics, Howard University, Washington, DC 20059, USA
3. Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, Anhui, People's Republic of China
4. Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
5. HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA