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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) August 26, 2016

Relaxation of Multiple Quantum NMR Coherences in Quasi-One-Dimensional Spin Systems

Georgy A. Bochkin, Edward B. Fel’dman and Sergey G. Vasil’ev

Abstract

Dynamics and relaxation of the multiple quantum (MQ) NMR coherences of the zeroth and second orders are studied experimentally and theoretically in a quasi-one-dimensional chain of nuclear spins 19F in calcium fluorapatite. The dependencies of the intensities of those coherences on the time of the preparation period of the MQ NMR experiment is obtained. A good agreement of the experiment with theoretical predictions is demonstrated. Dipolar relaxation of the MQ NMR coherences is investigated on the evolution period of the MQ NMR experiment. A theory of dipolar relaxation of the MQ NMR coherences is developed for the model in which only the ZZ part of the secular dipole–dipole interactions is taken into account (ZZ model). It is shown that the MQ NMR coherence of the zeroth order is not subject to dipolar relaxation in the ZZ model. The experimental data qualitatively agree with the results of the developed theory for the MQ NMR coherence of the second order.


Dedicated to: Kev Salikhov on the occasion of his 80th birthday.


Funding source: Russian Foundation for Basic Research

Award Identifier / Grant number: 16-03-00056

Award Identifier / Grant number: 16-33-00867

Funding statement: The authors thank Professor K.M. Salikhov for fruitful and stimulating discussions. The work is supported by the Russian Foundation for Basic Research (Grants No. 16-03-00056 and No. 16-33-00867) and the Program of the Presidium of RAS No. 1.26 “Electron Spin Resonance, Spin-Dependent Electron Effects and Spin Technologies” (Grant No. 0089-2015-0191).

Acknowledgments:

The authors thank Professor K.M. Salikhov for fruitful and stimulating discussions. The work is supported by the Russian Foundation for Basic Research (Grants No. 16-03-00056 and No. 16-33-00867) and the Program of the Presidium of RAS No. 1.26 “Electron Spin Resonance, Spin-Dependent Electron Effects and Spin Technologies” (Grant No. 0089-2015-0191).

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Received: 2016-5-31
Accepted: 2016-7-26
Published Online: 2016-8-26
Published in Print: 2017-3-1

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