Accession Number : ADA317268

Title :   Atomic Hydrogen Trapped in Solid H2.

Descriptive Note : Final rept.,

Corporate Author : HAWAII UNIV HONOLULU DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Gaines, James R.

PDF Url : ADA317268

Report Date : SEP 1996

Pagination or Media Count : 56

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.

Descriptors :   *TRAPPING(CHARGED PARTICLES), *ATOMS, *SOLIDS, *HYDROGEN, *ATOMIC STRUCTURE, DENSITY, MODELS, MOLECULES, QUANTUM THEORY, CARBON FIBERS, AMORPHOUS MATERIALS, CRYSTALS, ACTIVATED CARBON, COEFFICIENTS, ISOTROPISM, ISOTOPES, CATALYSTS, SUBSTITUTES, VACANCIES(CRYSTAL DEFECTS), DIFFUSION COEFFICIENT, RECOMBINATION REACTIONS, STORAGE, MOLECULAR PROPERTIES, TRITIUM.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Crystallography
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE