High pressure cosmochemistry applied to major planetary interiors: Experimental studies

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Cosmochemistry, Gas Giant Planets, High Pressure, Planetary Composition, Planetary Cores, Crystallography, Fluid-Solid Interactions, Spectroscopy, Vibrational Spectra, X Ray Spectroscopy

Scientific paper

The overall goal of this project is to determine properties of the H-He-C-N-O system, as represented by small molecules composed of these elements, that are needed to constrain theoretical models of the interiors of the major planets. Much of our work now concerns the H2O-NH3 system. This project is the first major effort to measure phase equilibria in binary fluid-solid systems in diamond anvil cells. Vibrational spectroscopy, direct visual observations, and X-ray crystallography of materials confined in externally heated cells are our primary experimental probes. We also are collaborating with the shockwave physics group at Lawrence Livermore Laboratory in studies of the equation of state of a synthetic Uranus fluid and molecular composition of this and other H-C-N-O materials under planetary conditions.

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