Electron spin resonance studies of radiation damage. Part I. An alternating linewidth effect for the (CH3)2ĊOH radical in gamma-irradiated acetone at low temperatures

1968 ◽  
Vol 46 (6) ◽  
pp. 1029-1031 ◽  
Author(s):  
F. P. Sargent
Keyword(s):  
Electron Spin Resonance ◽  
Temperature Dependence ◽  
Radiation Damage ◽  
Electron Spin ◽  
Low Temperatures ◽  
Methyl Groups ◽  
Oh Groups ◽  
Restricted Rotation ◽  
Spin Resonance ◽  
Gamma Irradiated

The e.s.r. spectrum of the (CH3)2ĊOH radical showed a drastic temperature dependence of linewidth in the range −196 to −100 °C, this being particularly pronounced for the M1 = ±2 lines. Possible mechanisms are discussed in terms of restricted rotation of the methyl groups and of the OH groups.

Electron spin resonance studies of radiation damage. Part III. Gamma irradiated acetonitrile

1970 ◽  
Vol 48 (11) ◽  
pp. 1780-1781 ◽  
Author(s):  
F. P. Sargent
Keyword(s):  
Electron Spin Resonance ◽  
Radiation Damage ◽  
Electron Spin ◽  
Thermal Decay ◽  
Spin Resonance ◽  
Gamma Irradiated

The effects of photobleaching and thermal decay at 77 and 87 °K on the electron spin resonance spectra of gamma irradiated acetonitrile are reported.

Electron spin resonance studies of radiation damage. Part II. Gamma-irradiated single crystals of sodium chlorate: The ClO3 radical

1968 ◽  
Vol 46 (10) ◽  
pp. 1818-1819 ◽  
Author(s):  
P. F. Patrick ◽  
F. P. Sargent
Keyword(s):  
Electron Spin Resonance ◽  
Radiation Damage ◽  
Single Crystals ◽  
Electron Spin ◽  
Sodium Chlorate ◽  
Spin Resonance ◽  
Gamma Irradiated

Single crystals of sodium chlorate were gamma irradiated and examined by e.s.r. at −196 °C. One of the species present was identified as ClO3.

scholarly journals EPR of Radiation Damage Centers in NaNO3, Sr(NO3)2, BaS, and MgC2O4·2H2O

1975 ◽  
Vol 30 (2) ◽  
pp. 269-270
Author(s):  
F. Köksal ◽  
H. Yüksel
Keyword(s):  
Electron Spin Resonance ◽  
Radiation Damage ◽  
Electron Spin ◽  
Room Temperature ◽  
Paramagnetic Species ◽  
Spin Resonance ◽  
Theoretical Predictions ◽  
Magnesium Oxalate ◽  
Gamma Irradiated

Abstract NaNO3, Sr(NO3)2, BaS, and MgC2O4·2 H2O powders have been gamma-irradiated at room temperature and their electron spin resonance spectra examined for paramagnetic species. The species identified were NO3 and NO2 radicals in the nitrates, SO2- and S in BaS, and H2C2O4- in magnesium oxalate. Theoretical predictions agree with these assignments.

THE ELECTRON-SPIN RESONANCE SPECTRA OF SOME METHYLATED ANTHRASEMIQUINONES: EVIDENCE FOR RESTRICTED ROTATION

1965 ◽  
Vol 43 (5) ◽  
pp. 1553-1559 ◽  
Author(s):  
R. M. Elofson ◽  
K. F. Schulz ◽  
B. E. Galbraith ◽  
R. Newton
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Steric Hindrance ◽  
Methyl Groups ◽  
Redox Potentials ◽  
Restricted Rotation ◽  
Spin Resonance

The hyperfine electron-spin resonance spectra of a number of methyl-substituted 9,10-anthrasemiquinones have been determined. The spectra have been analyzed by computer techniques, and splitting constants have been assigned for all protons. The results indicate that, while the parent quinones are essentially free of steric hindrance, the methyl groups in the α position of the reduced quinones are not free to rotate. The methyl groups in the β position of the semiquinones show normal hyperconjugative behavior. These results are consistent with the different redox potentials of these compounds revealed in a previous study.

Electron spin resonance studies of radiation damage. Part IV. The effect of photobleaching on the trapped radicals in gamma irradiated 2-methyltetrahydrofuran glasses at 77 °K

1970 ◽  
Vol 48 (21) ◽  
pp. 3453-3455 ◽  
Author(s):  
F. P. Sargent
Keyword(s):  
Electron Spin Resonance ◽  
Radiation Damage ◽  
Electron Spin ◽  
Trapped Electrons ◽  
Spin Resonance ◽  
Gamma Irradiated

The concentration of trapped radicals was found to decrease during the course of photobleaching trapped electrons in gamma irradiated 2-methyltetrahydrofuran glasses at 77 °K.

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