New Phases and Dissociation-Recombination of Hydrogen Deuteride to 3.4 Megabar

Abstract

We present infrared absorption studies of solid hydrogen deuteride to pressures as high as 3.4 megabar in a diamond anvil cell and temperatures in the range 5 to 295 K. Above 198 GPa the sample transforms to a mixture of HD ,H2 and D2, interpreted as a process of dissociation and recombination. Three new phases-lines are observed, two of which differ remarkably from those of the high-pressure homonuclear species, but none are metallic. The time-dependent spectral changes are analyzed to determine the molecular concentrations as a function of time; the nucleon exchange achieves steady state concentrations in ~20 hours at ~200 GPa.

11 pages, 4 figures, submitted

References in corpus (4)

• Density functional theory study of phase IV of solid hydrogen
• Quantum Monte Carlo study of the phase diagram of solid molecular hydrogen at extreme pressures
• Proton Transfer in Phase IV of Solid Hydrogen and Deuterium
• Spitzer observations of hydrogen deuteride

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• Understanding high pressure hydrogen with a hierarchical machine-learned potential
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• Towards the same line of liquid-liquid phase transition of dense hydrogen from various theoretical predictions
• Nuclear magnetic resonance spectroscopy as a dynamical structural probe of high pressure hydrogen
• Candidate structure for the H${}_2$-PRE phase of solid hydrogen
• 373 K Superconductors