Atomic Hydrogen Trapped in Solid H2.
Abstract
The technical work under this contract focused on production and storage of hydrogen atoms in molecular hydrogen hosts. Studies of the diffusion of molecules and atoms in hydrogen hosts were made. In crystalline solids D is controlled by the number of vacancies in the lattice. Values of the parameters used for theory were obtained for all isotopes. Data for the isotopes can be successfully scaled by the quantum parameter. The atom and molecule hop frequencies were found to be almost identical, making possible the prediction of atom recombination rates. Isotropic substitution has the same effect on the diffusion as increased pressure, but recombination coefficients for crystalline and amorphous solids differ. The anomalous atom growth curves in titrated solids were explained, and a method, based on filling the solid's vacancies, was found for obtaining large atom densities. A new model for in situ atom production for solids containing tritium was developed. Experiments yielding the diffusion coefficient of HD and H2 molecules absorbed on activated carbon fibers indicate that these fibers are effective catalysts of the ortho-para transition. Three suggestions are made for future investigation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1996
- Accession Number
- ADA317268
Entities
People
- James R. Gaines
Organizations
- University of Hawaiʻi System