Hydrogen-Helium Mixtures at High Pressure
نویسندگان
چکیده
The properties of hydrogen-helium mixtures at high pressure are crucial to address important questions about the interior of Giant planets e.g. whether Jupiter has a rocky core and did it emerge via core accretion? Using path integral Monte Carlo simulations, we study the properties of these mixtures as a function of temperature, density and composition. The equation of state is calculated and compared to chemical models. We probe the accuracy of the ideal mixing approximation commonly used in such models. Finally, we discuss the structure of the liquid in terms of pair correlation functions.
منابع مشابه
Equation of State Calculations of Hydrogen-Helium Mixtures in Solar and Extrasolar Giant Planets
Using density functional molecular dynamics simulations, we study the equation of state for hydrogen-helium mixtures at conditions of giant planet interiors of 0.2−2.3 g cm−3 and 1000−80000 K for a typical helium mass fraction of 0.245. In addition to computing internal energy and pressure, we determine the entropy by applying a thermodynamic integration technique in the presence of electronic ...
متن کاملPhase separation in hydrogen-helium mixtures at Mbar pressures.
The properties of hydrogen-helium mixtures at Mbar pressures and intermediate temperatures (4000 to 10000 K) are calculated with first-principles molecular dynamics simulations. We determine the equation of state as a function of density, temperature, and composition and, using thermodynamic integration, we estimate the Gibbs free energy of mixing, thereby determining the temperature, at a give...
متن کاملHydrogen-Helium Mixtures in the Interiors of Giant Planets
Equilibrium properties of hydrogen-helium mixtures under conditions similar to the interior of giant gas planets are studied by means of first principle density functional molecular dynamics simulations. We investigate the molecular and atomic fluid phase of hydrogen with and without the presence of helium for densities between ρ = 0.19 g cm and ρ = 0.66 g cm and temperatures from T = 500K to T...
متن کاملMeasurement of Hydrogen Balmer Line Broadening and Thermal Power Balances of Noble Gas-Hydrogen Discharge Plasmas
Line broadening of the hydrogen Balmer lines provides a sensitive measure of the number and energy of excited hydrogen atoms in a glow discharge plasma. The width of the 656.5 nm Balmer α line emitted from gas discharge plasmas having atomized hydrogen from pure hydrogen alone, hydrogen with magnesium or strontium, a mixture of 10% hydrogen and helium, argon, krypton, or xenon, and a mixture of...
متن کاملThe properties of hydrogen and helium under extreme conditions
Hydrogen and helium are the most abundant elements in the Universe. They are also, in principle, the most simple. Nonetheless, they display remarkable properties under extreme conditions of pressure and temperature that have fascinated theoreticians and experimentalists for over a century. Advances in computational methods have made it possible to elucidate ever more of their properties. Some o...
متن کامل