Accurate Equation of State of Fluid H<sub>2</sub>-He Mixtures.

ORAL

Abstract

An accurate compositionally dependent ρ-P equation of state (EOS) for H2-He is necessary for constraining and validating internal structure and evolutionary models of gas giant planetary interiors. A high accuracy (within 1%) EOS for this system is also required for precompression experiments on these components. The EOS was determined from sound velocity measurements obtained with Brillouin scattering on 9:1 and 1:1 H2:He mixtures at 300 K with pressures up to 5.4 GPa. The ρ-P relations are accurate over the pressure range studied and indicate ideal mixing at both compositions within experimental error. Related physical quantities and methods for the calculation of the equation of state are discussed.

*This work was supported by DOE-NNSA (DE-NA0003975, CDAC UIC) and NSF (DMR-210488, UIC; EAR – 1634415, GSECARS). This research used resources under DOE Contract No. DE-AC02-06CH11357.

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Presenters

  • Charlie M Zoller

    • University of Illinois at Chicago
    • Department of Physics, University of Illinois Chicago

Authors

  • Charlie M Zoller

    • University of Illinois at Chicago
    • Department of Physics, University of Illinois Chicago

  • Sakun Duwal

    • Sandia National Laboratories

  • Vitali Prakapenka

    • Center for Advanced Radiation Sources, University of Chicago
    • GSECARS

  • Stella Chariton

    • Center for Advanced Radiation Sources, University of Chicago
    • Center for Advanced Radiation Sources, The University of Chicago, IL 60637, USA
    • GSECARS

  • Sergey N Tkachev

    • GSECARS

  • Muhtar Ahart

    • University of Illinois at Chicago
    • Carnegie Inst of Washington
    • University of Illinois Chicago
    • Department of Physics, University of Illinois at Chicago

  • Russell J Hemley

    • University of Illinois at Chicago
    • University of Illinois Chicago
    • Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois Chicago
    • Department of Physics and Chemistry, University of Illinois Chicago, 845, W. Taylor Street, Chicago, IL 60607
    • Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois at Chicago