Shock-Compressed Methane to 400 GPa

ORAL

Abstract

Methane plays an important role in planetary physics and is a major constituent of giant planet atmospheres. At low temperatures, methane dissociates into diamond and hydrogen above 300 GPa. This transition is predicted to occur at lower pressures with increasing temperature, supporting the idea that diamond might make up a significant fraction of the deep interior of Neptune.[1–3] We present shock-compression data to 400 GPa for methane. The methane samples were precompressed in a diamond-anvil cell so that the experiments would be relevant to giant planets. Data are referenced to a quartz standard.

[1] M. Ross, Nature 292, 435 (1981).

[2] M. Ross and F. Rogers, Phys. Rev. B 74, 024103 (2006).

[3] G. Gao et al., J. Chem. Phys. 133, 144508 (2010).

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Presenters

  • G. Tabak

    Laboratory for Laser Energetics, U. of Rochester

Authors

  • G. Tabak

    Laboratory for Laser Energetics, U. of Rochester

  • Thomas Boehly

    Laboratory for Laser Energetics, University of Rochester, LLE, Lab for Laser Energetics, Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics, Laboratory for Laser Energetics

  • Gilbert W Collins

    University of Rochester, Departments of Mechanical Engineering, Physics and Astronomy, and Laboratory for Laser Energetics, Laboratory for Laser Energetics, Univ of Rochester, Laboratory for Laser Energetics, U. of Rochester, Univ of Rochester, Laboratory for Laser Energetics, University of Rochester, University of Rochester, Laboratory for Laser Energetics

  • L. E Crandall

    Univ of Rochester, Laboratory for Laser Energetics, U. of Rochester

  • Brian Joseph Henderson

    Univ of Rochester, University of Rochester, LLE, Laboratory for Laser Energetics, U. of Rochester

  • James Ryan Rygg

    Laboratory for Laser Energetics, Univ of Rochester, Laboratory for Laser Energetics, U. of Rochester, University of Rochester, University of Rochester, Laboratory for Laser Energetics, Univ of Rochester, Univ of Rochester

  • Marius Adrien Millot

    Lawrence Livermore Natl Lab

  • Suzanne J Ali

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Peter M Celliers

    Lawrence Livermore Natl Lab, Lawrence Livermore National Lab, Lawrence Livermore National Laboratory, Lawrence Livermore National Laboratory, Livermore, California

  • J H Henry Eggert

    Lawrence Livermore Natl Lab

  • D E Fratanduono

    Lawrence Livermore Natl Lab

  • S. Hamel

    Lawrence Livermore Natl Lab

  • D. Hicks

    Lawrence Livermore Natl Lab

  • Amy E Lazicki

    Lawrence Livermore Natl Lab

  • D. Swift

    Lawrence Livermore Natl Lab

  • S Brygoo

    CEA, CEA DAM DIF

  • P Loubeyre

    CEA, CEA DAM DIF

  • Ryosuke Kodama

    Osaka U., Institute of Laser Engineering, Osaka University

  • K. Miyanishi

    Osaka University, Osaka U.

  • T. Ogawa

    Osaka U.

  • N. Ozaki

    Osaka University, Osaka Univ, Osaka U.

  • Takayoshi Sano

    Osaka U., Osaka Univ, ILE, Osaka Univ

  • R Jeanloz

    U. of California, Berkeley, Univ of California - Berkeley