Abstract
We present infrared absorption studies of solid hydrogen deuteride to pressures as high as 340GPa (100 GPa=1 Mbar) in a diamond anvil cell and temperatures in the range 5-295K. Above 198GPa the HD sample transforms to a mixture of HD, H_{2}, and D_{2}, interpreted as a process of dissociation and recombination. Three new phase 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 h at ∼200 GPa.
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