Samples of trans-polyacetylene, modified with deuterium in such a way as to produce sp3 orbital defects, have been studied by EPR and NMR techniques. Both the EPR linewidth and the NMR spin-lattice relaxation time are found to be temperature dependent for all the samples. Moreover, the EPR lines are motionally narrowed and the NMR relaxation time is relatively short, indicative of soliton spin motion. The temperature dependence of the soliton diffusion rate is extracted from the data. A simple model to explain the nuclear relaxation rate is proposed. The sp3 orbitals reduce the intrachain diffusion of solitons by 2 orders of magnitude, so that one-dimensional behavior is no longer observed.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics