Dipolar relaxation of multiple-quantum NMR coherences in a linear homogeneous chain of 19F nuclei in calcium fluoroapatite
Abstract
Experimental and theoretical investigations of dynamics and relaxation of multiple quantum (MQ) nuclear magnetic resonance (NMR) coherences of the zeroth and second orders are performed in a quasi-one-dimensional chain of nuclear spins of 19F in calcium fluorapatite. MQ NMR dynamics are studied on the preparation period of the MQ NMR experiment in the approximation of nearest neighbor interactions. The density matrix of the system at the end of the preparation period is used as the initial condition for the study of the relaxation process on the evolution period of the MQ NMR experiment. The relaxation asymptotics of the intensity of the MQ NMR coherence of the zeroth order is obtained. Relaxation of the MQ NMR coherence of the second order is investigated with ZZ part of the dipole-dipole interactions. The experimental data qualitatively agree with the results of the developed theory.
Keywords
multiple quantum NMR,
multiple quantum coherence,
relaxation,
fermions,
dipole-dipole interactions,
zz-model,
decoherence,
coherent clusters
Supporting agencies: This 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".
About the Authors
G. A. Bochkin
Institute of Problems of Chemical Physics of Russian Academy of Sciences
Russian Federation
Russian Federation
Academician Semenov avenue 1, Chernogolovka 142432, Moscow Region
E. B. Fel'dman
Institute of Problems of Chemical Physics of Russian Academy of Sciences
Russian Federation
Russian Federation
Academician Semenov avenue 1, Chernogolovka 142432, Moscow Region
S. G. Vasil'ev
Institute of Problems of Chemical Physics of Russian Academy of Sciences
Russian Federation
Russian Federation
Academician Semenov avenue 1, Chernogolovka 142432, Moscow Region
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Review
For citations:
Bochkin G.A., Fel'dman E.B., Vasil'ev S.G. Dipolar relaxation of multiple-quantum NMR coherences in a linear homogeneous chain of 19F nuclei in calcium fluoroapatite. Magnetic Resonance in Solids. 2016;18(2):16202 (6 pp.).
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