Accession Number : AD0811582

Title :   ION CHEMISTRY.

Descriptive Note : Annual summary rept. 1 Nov 65-31 Oct 66,

Corporate Author : KANSAS UNIV LAWRENCE DEPT OF CHEMISTRY

Personal Author(s) : Kevan, Larry ; Zimbrick, John ; Viswanathan, N. S.

Report Date : 30 NOV 1966

Pagination or Media Count : 92

Abstract : The paramagnetic relaxation characteristics of trapped electrons and hydrogen atoms in gamma-irradiated alkaline and acid ices respectively were studied by power saturation methods. The relaxation times were measured as a function of radiation dose, deuteration, phase and temperature. Line widths were measured under various conditions. The trapped electron EPR line is inhomogeneously broadened by nuclear hyperfine interactions; the spin-lattice relaxation mechanism is a cross relaxation process with 0(-). The electrons are trapped with a nonuniform spatial distribution in hydroxyl anion vacancies in radiation-produced spurs of 25 A radius. The trapped hydrogen atom EPR line is inhomogeneously broadened by nuclear hyperfine interactions and homogeneously broadened probably by dipolar spin-spin interactions; the spin-lattice relaxation mechanism is probably phonon modulation of the dipolar spin-spin interaction. The H atoms are trapped with spatial uniformity at interstitial sites near oxyanions. t-C4H9(+) reactions in liquid isobutene were also studied. An experimental technique for generating ions in the vapor by photoionization and then injecting them into a liquid with an electric field is described. A study of the C8 products showed that olefins predominate. Proton transfer is the important termination step for the t-C4H9(+) reactions but hydride transfer also occurs. (Author)

Descriptors :   *RADIOGRAPHY), (*ICE, (*PARAMAGNETIC RESONANCE, ICE), PARAMAGNETIC RESONANCE, GAMMA RAYS, ELECTRON BEAMS, PHOTOLYSIS, ACETONES, X RAYS, GAS CHROMATOGRAPHY, DEUTERIUM ION CONCENTRATION, TEMPERATURE, INTERACTIONS, IONIZATION, HYDRIDES, MOLECULAR WEIGHT, ALKENES, STATISTICAL PROCESSES, RELAXATION TIME.

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE