期刊
CONTRIBUTIONS TO PLASMA PHYSICS
卷 47, 期 4-5, 页码 375-380出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ctpp.200710050
关键词
density functional molecular dynamics; equation of state; giant gas planets; hydrogen-helium mixtures
资金
- EPSRC [EP/D062837/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D062837/1] Funding Source: researchfish
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 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. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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