Spatial distribution of paramagnetic entities in. gamma. -irradiated 2-methyltetrahydrofuran glass as studied by the electron spin echo method
Journal Article
·
· J. Phys. Chem.; (United States)
In order to examine the paramagnetic relaxation and the spatial distribution of radiation-generated paramagnetic entities, electron spin echo measurements were made for biphenyl anions (Bp/sup -/.) and localized electrons (e/sub loc//sup -/) in glassy 2-methyltetrahydrofuran (MTHF) matrices with and without solute biphenyl irradiated with ..gamma..-rays at 77 K and at various radiation doses. The rates of both the longitudinal and transverse relaxations were found to increase with the increase in radiation dose, though the relaxation kinetics did not follow a simple exponential behavior because of various magnetic environments for Bp/sup -/. and e/sub loc/sup -/. Comparison with the results for chemically generated and randomly distributed Bp/sup -/. in the glassy MTHF matrix revealed that the paramagnetic relaxations of the radiation-generated Bp/sup -/. and e/sub loc//sup -/ are largely due to the magnetic dipolar interaction with the free radicals formed from MTHF molecules. The average distance between Bp/sup -/. and the paired free radical originating from a single ionization event was estimated to be 4.4 +/- 0.4 nm from the relaxation rate extrapolated to zero dose. 20 references 7 figures.
- Research Organization:
- Hokkaido Univ., Sapporo, Japan
- OSTI ID:
- 6120733
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:15; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
400600* -- Radiation Chemistry
AROMATICS
BIPHENYL
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
FURANS
GAMMA RADIATION
GLASS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
IONIZING RADIATIONS
KINETICS
LOW TEMPERATURE
MAGNETIC RESONANCE
MTHF
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
RADIOLYSIS
REACTION KINETICS
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
TETRAHYDROFURAN
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
400600* -- Radiation Chemistry
AROMATICS
BIPHENYL
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
FURANS
GAMMA RADIATION
GLASS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
IONIZING RADIATIONS
KINETICS
LOW TEMPERATURE
MAGNETIC RESONANCE
MTHF
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
RADIOLYSIS
REACTION KINETICS
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
TETRAHYDROFURAN