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The Motionally Narrowed Nmr Line Shape of Ammonium Selenate,*

Published online by Cambridge University Press:  15 February 2011

Ching Yao ,
R. Hallsworth  and
I. J. Lowe
Ching Yao
Affiliation:
Physics Department, University of Pittsburgh, Pittsburgh, PA 15260
R. Hallsworth
Affiliation:
Physics Department, University of Pittsburgh, Pittsburgh, PA 15260
I. J. Lowe
Affiliation:
Physics Department, University of Pittsburgh, Pittsburgh, PA 15260
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Abstract

The proton free induction decay f(t) of ammonium selenate is measured from temperatures of no apparent effects of lattice motion (−185°C) upon f(t), to substantial motional effects (−145°C) upon f(t). Our measured results are consistent with a classical hindered rotational motion of the ammonium group. The deviation of f(t) from the rigid-lattice fid fo(t) can be expanded in a Taylor series as

From the Δ1f(t) data, a3 and a4 are derived, and they are well fitted by the simple relations

where ν is the jump frequency of the rotational motion, T1r is the rotating-frame spin-lattice relaxation time, and ω1 the strength of the rotating magnetic field in frequency units. α, C3 and C4 are calculable constants of order unity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 3: Symposium – Nuclear and Electron Resonance Spectroscopies Applied to Materials Science , 1980 , 501
Copyright
Copyright © Materials Research Society 1981

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Footnotes

*

Supported by NSF Grant DMR 78-15441.

References

REFERENCES

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