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

Thesis/Dissertation · Wed Jan 01 00:00:00 EST 1975

OSTI ID:7318299

Bowman, M K

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
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

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