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.

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.

Detection of trapped electrons in organic glasses after gamma irradiation at 4.2 °K by electron spin resonance spectroscopy

1967 ◽  
Vol 45 (22) ◽  
pp. 2723-2727 ◽  
Author(s):  
D. R. Smith ◽  
J. J. Pieroni
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Dipole Interaction ◽  
Necessary Condition ◽  
Resonance Spectroscopy ◽  
Hydrogen Atoms ◽  
Trapped Electrons ◽  
Organic Glasses ◽  
Spin Resonance ◽  
Gamma Irradiated

Several organic glasses which are known to form trapped electrons when gamma irradiated at 77 °K have been irradiated at 4.2 °K and examined by electron spin resonance (e.s.r.) at the same temperature. In each case an absorption is observed which is probably due to trapped electrons. In three cases, the yield of trapped electrons at 4.2 °K seems to be as great as at 77 °K. In one case, a glassy alkane, the yield is enhanced at 4.2 °K. Trapped electrons in ethanol give a narrower e.s.r. line at 4.2 °K than at 77 °K, suggesting less orientation in the solvent cage.Trapped hydrogen atoms are not detected after irradiation at 4.2 °K. Contrary to prediction, hydrogen atoms are also not detected after post-irradiation photolysis of the trapped electrons.The results suggest that electron traps exist prior to irradiation and that molecular orientation via electronic dipole interaction is not a necessary condition for electron trapping. The results do not distinguish between trapping in solvent defects or trapping via electron-induced polarization of molecular orbitals.

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 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.

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