Accession Number : ADA289818

Title :   High Energy Density Systems in Cryogenic Media: The Production and Reactions of Atoms and Radicals.

Descriptive Note : Final rept. 21 May 90-1 Oct 94,

Corporate Author : NORTHWESTERN UNIV EVANSTON IL DEPT OF CHEMISTRY

Personal Author(s) : Weitz, Eric

PDF Url : ADA289818

Report Date : NOV 1994

Pagination or Media Count : 44

Abstract : The work in this study has been directed towards developing an understanding of the factors that affect the production and storage of energetic species in a cryogenic environment and to evaluate the feasibility of employing such a medium for use as a high energy density material. Matrix isolation techniques have been employed to produce and attempt to store reactive species, specifically atoms in cryogenic solids, with a focus on storage of O and H atoms. Factors that must be considered in optimizing the storage of photolytically produced atoms include: matrix temperature, photolysis wavelength, spin state of the atoms, reactions with co-fragments and parent, the relative mass of the photofragments, and diffusion and photoinduced diffusion of the photofragments and/or the parent molecule. The interplay between these factors and their effect on atom storage is considered. O atom storage in solid Xe at a 32 mmolar concentration has been achieved with a number of enumerated strategies possible for increasing this concentration. H atoms have been successfully isolated and are stable in solid Xe for days at a temperature of 10 K. Progress directed towards storing O atoms in solid O2 is reported on. (jg)

Descriptors :   *ATOMS, *HIGH ENERGY, *HIGH DENSITY, *CRYOGENICS, FREQUENCY, ENVIRONMENTS, PRODUCTION, PHOTOCHEMICAL REACTIONS, PHOTOLYSIS, MOLECULES, MATERIALS, COMPOSITE MATERIALS, MASS, ISOLATION, REACTIVITIES, SOLIDS, HYDROGEN, OXYGEN, MEDIA, DIFFUSION, STORAGE, ENERGETIC PROPERTIES, BROMIDES, XENON, SPIN STATES, MATRIX THEORY, CHEMICAL RADICALS.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE