Properties of Dense Fluid Hydrogen and Helium in Giant Gas Planets

Details Properties of Dense Fluid Hydrogen and Helium in Giant Gas Planets Properties of Dense Fluid Hydrogen and Helium in Giant Gas Planets

2007-01-15

arxiv.org/abs/cond-mat/0701313v1

Physics

Condensed Matter

Materials Science

6 pages, 3 figures, 1 table, proceedings PNP12

Scientific paper

10.1002/ctpp.200710050

Equilibrium properties of hydrogen-helium mixtures under thermodynamic conditions found in the interior of giant gas planets are studied by means of density functional theory molecular dynamics simulations. Special emphasis is placed on the molecular-to-atomic transition in the fluid phase of hydrogen in the presence of helium. Helium has a substantial influence on the stability of hydrogen molecules. The molecular bond is strengthened and its length is shortened as a result of the increased localization of the electron charge around the helium atoms, which leads to more stable hydrogen molecules compared to pure hydrogen for the same thermodynamic conditions. The {\it ab initio} treatment of the mixture enables us to investigate the structure of the liquid and to discuss hydrogen-hydrogen, helium-helium, and hydrogen-helium correlations on the basis of pair correlation functions.

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