Abstract

Narrowing mechanism of an ESR (Electron Spin Resonance) line in undoped cis- and trans-polyactylene, (CH) x , are discussed based on the temperature dependence of the ESR linewidths and line shapes. In a high temperature region, the classical thermal motion of a soliton is found to be inadequate to explain the observed motional narrowing, and it is found necessary to take a diffusive motion into account.

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