1. a High Pressure Science and Engineering Center, Department of Physics , University of Nevada , Las Vegas , NV , 89154-4002 , USA
2. b Lindhurst Laboratory of Experimental Geophysics , Seismological Laboratory, California Institute of Technology , Pasadena , CA , 91125 , USA
3. c Plasma Physics (P-24) and Earth and Environmental Sciences (EES-11) , Los Alamos National Laboratory , Los Alamos , NM , 87545 , USA
4. d Division of Geological and Planetary Sciences , California Institute of Technology , Pasadena , CA , 91125 , USA