NUCLEAR MAGNETIC RELAXATION IN POLYACETYLENEReportar como inadecuado




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Abstract : Nuclear spin-lattice relaxation rates for 1H and 13C in polyacetylene cannot be adequately explained in terms of either nuclear spin diffusion to a static paramagnetic defect or rapid one-dimensional diffusion of the defect itself. We propose a model in which only a small fraction of the molecular chains contain defects. Nuclei on these chains are rapidly relaxed, while the remainder achieve equilibrium by nuclear spin diffusion. The dependences of the measured relaxation rates upon frequency and isotopic concentration are in agreement with the predictions of this model.





Autor: J.-C. Scott T. Clarke

Fuente: https://hal.archives-ouvertes.fr/



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