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arXiv · 1510.05686

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

Ranga P. Dias·Ori Noked·Isaac F. Silvera
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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.

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Ranga P. Dias, Ori Noked, Isaac F. Silvera. 2015-10-19. New Phases and Dissociation-Recombination of Hydrogen Deuteride to 3.4 Megabar. https://doi.org/10.1103/physrevlett.116.145501

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