Experimental study of planetary gases with applications to planetary interior models

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Gases, High Pressure, Laboratories, Models, Planetary Atmospheres, Planetary Structure, Helium, Hydrogen, Neon, Phase Transformations, Planetary Surfaces, Solidification, X Ray Diffraction, Xenon

Scientific paper

High-pressure experimental data on planetary materials are critical in developing planetary models and in addressing otherwise insoluble problems of the internal structure of the major planets. Progress in the last five years has been particularly marked. Maximum static pressure of 550 GPa was achieved. For the first time, X-ray diffraction of solidified gases (Ne, Xe) and ices (H2O) were obtained at pressures above one megabar, single-crystal diffraction of ultralight elements (H2, He) were detected up to 25 GPa, pressures over 200 GPa at 77 K were reached in solid hydrogen, including the discovery of a phase transformation in the molecular solid. Advances in instrumentation and new measurements performed during 1983 to 1988 are summarized.

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