Abstract
Ingram and Tapley1 and Uebersfeld and Erb2 have observed that electron spin resonance in certain carbons can be affected by oxygen. Austen and Ingram3 showed that the electron spin resonance signal given by a carbon in vacuum may be (a) broadened, (b) reduced in total integrated intensity, by exposure to oxygen at room temperature. In both cases, it was found possible to restore the signal to the value it possessed in vacuum by outgassing the sample for a few minutes at room temperature.
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