Abstract
ESR spectra of N 2 +-irradiated polyimide (Kapton) films have been investigated as a function of the irradiation dose. Two narrow single lines with slightly different g-values close to 2.003 have been detected in the highly irradiated Kapton films, and they have tentatively been assigned to giant aromatic radicals being in the areas of different carbonization stages. The Kr + -irratiation has given ESR spectra similar to those by the N 2 +-irradiation. Some different features of the ESR spectra between the carbonaceous substances produced by ion-irradiation and those by pyrolysis have been discussed.
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