Abstract
Radicals produced by uv light in single crystals of dimethylglyoxime have been studied by ESR, in order to compare with those produced by high energy radiations. It has been found that a pair of dissimilar isolated iminoxy radicals is formed with approximately the same relative yield. The nitrogen hyperfine coupling and g tensors for the two species are considerably different from each other, but the relative orientation of the magnetic tensors differs only by a few degrees. The cause of this difference is tentatively attributed to the mode of radical formation, that is, one is formed from the O–H bond scission through excitation and the other is formed from the abstraction reaction by the hydrogen atom. The results are discussed in relation to the triplet radical pairs and isolated iminoxy radicals produceed by high energy radiations.
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