Abstract
The room temperature ESR spectrum of plasma-irradiated polyethylene exhibits an apparent sextet spectrum, which is virtually identical with that of γ-irradiated PE at 77 K. It was found with the aid of systematic computer simulations, however, that the room temperature ESR spectrum consists of three kinds of spectralcomponents: a sextet spectrum (I) as a major spectrum, a septet spectrum (II), and a smeared-out broad line (III). The sextet and septet spectra were assigned to the midchain alkyl radical, -CH 2 CHCH 2 -, and the allylic radical, -CH 2 CHCH=CHCH 2 -, respectively, as in the case of those in γ-irradiated PE
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