Spatial distribution of paramagnetic entities in. gamma. -irradiated 2-methyltetrahydrofuran glass as studied by the electron spin echo method
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), Vol. 88:15
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BIPHENYL
ELECTRON SPIN RESONANCE
MTHF
RADIOLYSIS
RADICALS
CHEMICAL REACTION KINETICS
EXPERIMENTAL DATA
GAMMA RADIATION
GLASS
LOW TEMPERATURE
SPIN-LATTICE RELAXATION
AROMATICS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
FURANS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
IONIZING RADIATIONS
KINETICS
MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
REACTION KINETICS
RELAXATION
RESONANCE
TETRAHYDROFURAN
400600* - Radiation Chemistry
400104 - Spectral Procedures- (-1987)