THE FORMATION OF ION RADICALS BY GAMMA IRRADIATION OF THE TETRA- HYDROFURANSTYRENE SYSTEM AT -196 C

Journal Article · Mon Apr 01 04:00:00 EST 1963 · Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals

OSTI ID:4715684

Nepomnyashchii, A I; Muromtsev, V I; Bagdasar'yan, Kh S

Samples of tetrahydrofuran (THF), styrene, and mixtures of these two compounds were freed from air in high vacuum and were irradiated at - 196 un. Concent 85% C by Co/sup 60/ at a dose from 0.14 to 6 x 10/sup 6/ rads. Polycrystalline THF irradiated at - 196 un. Concent 85% C showed an electron paramagnetic resonance (EPR) spectrum having a 5-component, superfine structure due to the action of an unpaired electron with four protons. The ratio of intensities of the components approached a binomial distribution at - 160 un. Concent 85% C, and the resulting EPR spectrum could be assigned to a cation radical of THF with the positive charge on the oxygen atom. On irradiating a solution of styrene in THF (2.18 mol/l) at--196 un. Concent 85% C with a dose of 0.14 x 10/sup 6/ rads, it was found that the form of the EPR signal depends on the power level of the signal generator. A saturated signal was observed at 5 Mw, and an unresolved singlet was obtained at a low power of 5 Mw. The signal form of gamma -irradiated, pure THF did not depend on the irradiation dose (from 0.14 to 6.0 x 10/sup 6/ rads) in the absence of saturation, but the intensity was proportional to the dose. A study of the irradiation of mixtures of styrene and THF showed that a saturated signal is obtained at a lower power level for a lower irradiation dose. The power of the signal generator was a factor of 20 less at a dose of 0.14 x 10/sup 6/ rads as compared to a dose of 0.84 x 10/sup 6/ rads. Illumination of an irradiated styrene solution in THF with light from a mercury vapor lamp resulted in the disappearance of one of the characteristic singlet lines, and was proof of the formation of two radicals during the gamma -irradiation of this system. The variation in signal form as a function of power level of the signal generation can be explained by the different times of relaxation and cross-relaxation of these two radicals. Apparently, an anion radical of styrene is formed by capture of a thermal electron during the gamma irradiation. (TTT)

• Research Organization: Karpov Inst. of Physical Chemistry, USSR
• NSA Number: NSA-17-023395
• OSTI ID: 4715684
• Journal Information: Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals, Journal Name: Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals Vol. Vol: 149; ISSN DANKA
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

CAPTURE
CHEMISTRY
COBALT 60
ELECTRONS
FREE RADICALS
GAMMA SOURCES
HYPERFINE STRUCTURE
IONS
IRRADIATION
LOW TEMPERATURE
MAGNETIC RESONANCE
MIXING
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
RADIATION DOSES
STYRENE
VACUUM