1. HPCAT, Advanced Photon Source, Building 434E, Argonne National Laboratory, Argonne, Illinois 60439-4803, Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C., 20015, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada K1A 0R6, Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, and Mineral Physics Institute, State University of New York at Stony Brook, Stony Brook, New York 11794