First Principles Simulations of Hydrogen and Helium at High Pressures
Morales, Miguel Angel
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https://hdl.handle.net/2142/80616
Description
Title
First Principles Simulations of Hydrogen and Helium at High Pressures
Author(s)
Morales, Miguel Angel
Issue Date
2009
Doctoral Committee Chair(s)
Duane Johnson
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Astronomy and Astrophysics
Language
eng
Abstract
We also study the equation of state of hydrogen, helium and hydrogen-helium mixtures at pressures beyond 200 GPa. We find very good agreement between both simulation methodologies for pressures beyond 600 GPa. From the equation of state calculations, an analysis of the miscibility properties of the mixture is performed. We find that the temperatures for the dcmixing of helium and metallic hydrogen are sufficiently high to cross the planetary adiabat of Saturn at pressures around 5 Mbar. Helium is partially miscible throughout a significant portion of the interior of Saturn, and to a lesser extent in Jupiter. These results are directly relevant to models of the interior structure and evolution of Jovian planets.
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