Microscopic dynamics of compressed molecular hydrogen is important for understanding its transport properties at high density as well as for improvement of hydrogen storage technology. To observe it at very high density, nuclear magnetic relaxation times of molecular hydrogen were measured at room temperature using a diamond anvil cell. Collision dynamics of the compressed H 2 gas was determined at pressures to 1.8 GPa, and the results are in good agreement with the standard kinetic theory assuming hard-sphere molecules. Collision and diffusion dynamics of dense H 2 in a H 2O framework (filled-ice Ic hydrogen's hydrate) were determined at pressures to 4.6 GPa, and it was demonstrated that active translational diffusion of H 2 through the leaky H 2O framework occurs throughout the observed pressure range.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films