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Electron spin lattice relaxation of radiation produced trapped electrons and trapped hydrogen atoms in glassy matrices

Thesis/Dissertation ·
OSTI ID:7318299
The relaxation rate was studied at 6 and 130/sup 0/K at 9.2 GHz. The matrices studied are sodium hydroxide ice, ethanol, methanol, 2-methyltetrahydrofuran (MTHF), and 85% phosphoric acid. Trapped electrons in methanol appeared to be strongly coupled to the tunneling rotation of the methyl groups in the matrix. The methyl groups appear to be uncoupled from the lattice. The spin lattice relaxation rate of the oxygen radical anion in sodium hydroxide was also studied and found to be predominantly a Raman process with a Debye temperature of about 100K. The new spin lattice relaxation process involves the modulation of the electron nuclear dipolar interaction by the tunneling of magnetic nuclei in the environment of the radicals, leading to a relaxation rate which depends linearly on the temperature and inversely on the square of the EPR frequency. The spin lattice relaxation of trapped electrons and deuterium atoms in deuterated matrices were studied in sodium hydroxide ice, ethanol and phosphoric acid. Deuteration of the matrix affected the spin lattice relaxation rate only in ethanol. Doping sodium hydroxide with oxygen-17 had no effect on the relaxation rate. Spin lattice relaxation of trapped electrons and trapped hydrogen atoms in these matrices is caused by interactions with distant nuclei and not the closer nuclei which determine the EPR spectrum.
Research Organization:
Wayne State Univ., Detroit, MI (USA)
OSTI ID:
7318299
Country of Publication:
United States
Language:
English

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Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALCOHOLS
ALKALI METAL COMPOUNDS
ATOMS
CHEMICAL RADIATION EFFECTS
CHEMISTRY
CRYOGENIC FLUIDS
DEUTERIUM COMPOUNDS
ELECTRON SPIN RESONANCE
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ETHANOL
FERMIONS
FLUIDS
FURANS
GLASS
HETEROCYCLIC COMPOUNDS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
ICE
INORGANIC ACIDS
LEPTONS
LOW TEMPERATURE
MAGNETIC RESONANCE
METHANOL
MTHF
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORIC ACID
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RELAXATION
RESONANCE
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
TRAPPED ELECTRONS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE