Abstract

In NMR spectroscopy of condensed phases, the space coordinates of the magnetic nuclei are generally treated classically and only the spin degrees of freedom are quantized. This approach can fail for atomic groupings of a periodic structure whose topomers differ by permuted labels of light nuclei such as protons or deuterons, and are separated by low energy barriers. The spectra of such systems can show apparent proton-proton or deuteron-deuteron couplings resulting from spin-space correlations of the nuclear space and spin degrees of freedom, imposed by the symmetrization postulate of quantum mechanics. In this chapter, the stick spectra of such systems will be considered.

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