Accession Number:

AD0765939

Title:

Theoretical Description of the Proton Magnetic Resonance Line Shapes of Ammonium Ions under the Influence of Tunneling,

Descriptive Note:

Corporate Author:

WATERLOO UNIV (ONTARIO) DEPT OF PHYSICS

Personal Author(s):

Report Date:

1972-05-31

Pagination or Media Count:

12.0

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 12 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

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE