Optical signature of hydrogen-helium demixing at extreme density-temperature conditions

被引：24
|
作者：
Soubiran, F. [1 ,2 ]
Mazevet, S. [2 ,3 ]
Winisdoerffer, C. [1 ]
Chabrier, G. [1 ,4 ]
机构：
[1] Univ Lyon, Ecole Normale Super Lyon, CRAL, UMR CNRS 5574, F-69364 Lyon 07, France
[2] CEA DAM DIF, F-91297 Arpajon, France
[3] CNRS Univ Paris Diderot, LUTH UMR 8102, Observ Paris, F-92195 Meudon, France
[4] Univ Exeter, Sch Phys, Exeter EX4 4PE, Devon, England
来源：
PHYSICAL REVIEW B | 2013年 / 87卷 / 16期
基金：
欧洲研究理事会;
关键词：
MOLECULAR-DYNAMICS; PHASE-SEPARATION; GIANT PLANETS; LOW-MASS; STARS;
D O I：
10.1103/PhysRevB.87.165114
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
By performing direct simulations of demixing for an equimolar mixture of hydrogen and helium, we find that reflectivity measurements performed during dynamic experiments could be used to identify this liquid-liquid phase transition under conditions encountered in giant planet interiors. These first principles simulations show that the reflectivity exhibits a distinctive signature at wavelengths currently available using VISAR (velocity interferometer system for any reflector) measurements. We further make the first estimation of the demixing timescale under such extreme conditions and find that it appears compatible with dynamic measurements. DOI: 10.1103/PhysRevB.87.165114
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页数：5
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