Related Experiment Video
Updated: Mar 22, 2026

Methane Hydrate Crystallization on Sessile Water Droplets
Published on: May 26, 2021
New Phases and Dissociation-Recombination of Hydrogen Deuteride to 3.4 Mbar
Ranga P Dias1, Ori Noked1, Isaac F Silvera1
1Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Abstract:
We present infrared absorption studies of solid hydrogen deuteride to pressures as high as 340 GPa (100 GPa=1 Mbar) in a diamond anvil cell and temperatures in the range 5-295 K. Above 198 GPa 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.
More Related Videos
14:11Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
Published on: March 29, 2016
09:18Time-resolved ElectroSpray Ionization Hydrogen-deuterium Exchange Mass Spectrometry for Studying Protein Structure and Dynamics
Published on: April 17, 2017
Related Concept Videos
¹H NMR of Labile Protons: Deuterium (²H) Substitution
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
Phase Transitions: Sublimation and Deposition
Phase Transitions: Vaporization and Condensation
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Phase Diagrams