Abstract
Abstract : A theoretical treatment for the NMR absorption line shape of a tetrahedral group of portons under the influence of tunneling has been developed for the particular case of NH4(+) ions. For the applied field parallel to a twofold axis of the ion the derived line shapes depend on a single splitting parameter J. This is a measure of the tunneling splitting of the torsional ground state in comparison to the dipolar energy of the ion. As J varies from 0 to infinity the calculated line shapes are found to vary between the limiting cases of the distinguishable proton (four spin 1/2) and indistinguishable proton (spin isomeric) situations, respectively. These theoretical line shapes are compared with the observed 'rigid-lattice' line shapes reported for the halides NH4Cl, NH4Br, and NH4I. (Modified author abstract)
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