Investigation of the High P-T Behavior of Binary Hydrogen-Helium Mixtures

Details Investigation of the High P-T Behavior of Binary Hydrogen-Helium Mixtures Investigation of the High P-T Behavior of Binary Hydrogen-Helium Mixtures

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmmr23a1022k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #MR23A-1022

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3924 High-Pressure Behavior, 3934 Optical, Infrared, And Raman Spectroscopy, 5724 Interiors (8147), 6220 Jupiter

Scientific paper

The gas giant planets are currently thought to be composed primarily of hydrogen-helium mixtures, with the interiors of these planets potentially composed of metallic hydrogen. The phase diagram for one such binary H2-He mixture (70% He and 30% H2) was investigated in the pressure-temperature region of 300- 500 K and 2-10 GPa with the goal of developing a satisfactory experimental methodology for mapping the temperature-pressure-composition space of the H2-He system. The gas mixture was loaded into a diamond anvil cell, with both resistance laser heating methods employed to access high temperatures. Raman spectroscopy was then used to monitor the temperature and pressure dependence of the H2 vibron. We find that the H2 vibron frequency of the H2-He mixture (4305 cm-1) is significantly higher than that of pure H2 (4200 cm-1) at 6 GPa, indicating that He dilutes H2 and disrupts the intermolecular coupling. Preliminary studies of the data at higher temperatures (> 370 K) indicate that the vibron frequencies tend to follow the same general trend with pressure as observed at lower temperature. The results of this study agree well with similar studies carried out in different pressure and temperature regimes.

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