1. Department of Chemistry, University of California, Berkeley, California 94720, USA
2. Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550, USA
3. Shock and Detonation Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
4. Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA