Transient Ionization of Shock Compressed Water Near Planetary Isentropes

Details Transient Ionization of Shock Compressed Water Near Planetary Isentropes Transient Ionization of Shock Compressed Water Near Planetary Isentropes

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p11b1266g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P11B-1266

Physics

5422 Ices, 5430 Interiors (8147), 5724 Interiors (8147), 6255 Neptune, 6293 Uranus

Scientific paper

We report herein first principles simulations of water under shock loading near the isentropes of Neptune and Uranus. Accurate description of the chemical mechanism for the ionic conductivity at high pressures and temperatures is of particular importance to models of the planetary dynamo mechanism in these planets. Using a novel simulation technique for shock compression, we are able to make excellent comparison to the experimental results for the Hugoniot pressure, temperature and density final states. Our simulations resolve controversy by showing that a unimolecular mechanism for electric conduction dominates at high pressures along the shock Hugoniot. Near the approximate intersection of the Hugoniot and the planetary isentrope we observe high concentrations of negatively charged species that contribute electronic states near the band gap. Our results provide a microscopic picture of the chemistry at planetary depths of ca. 6000 km and greater. * This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.

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