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).

*This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0001944.

–

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