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The complete chemical shift tensor of the carbons in crystalline polyoxymethylene is determined via the two-dimensional dipolar correlated 13C chemical shift NMR technique. The orientation of the tensor is determined by the local tetrahedral symmetry of the C2H2O2 unit and not by the overall symmetry of the helical chains. In an accompanying paper this shift tensor is used to study ultraslow motions in polyoxymethylene.
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Maas et al. (1987) studied this question.
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