Structural study of spurs by dynamic nuclear polarization method

Kumada, Takayuki   ; Noda, Yohei; Ishikawa, Norito   ; Takegahara, Keisuke*

We carried out dynamic nuclear polarization study of electron- and ion-beam irradiated polyethylene. We found that grow and decay rates of polarization linearly increased proportional to the concentration of alkyl radicals, whereas they quadratically increased with TEMPO concentration in TEMPO-doped polystylene. This result suggests that pairs of alkyl radicals are produced by the radiolysis. The pair distance is estimated to be less than 1 nm.