mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-117Research ArticleСтатьиDipolar relaxation of multiple-quantum NMR coherences in a linear homogeneous chain of 19F nuclei in calcium fluoroapatiteBochkinG. A.

Academician Semenov avenue 1, Chernogolovka 142432, Moscow Region

bochkin.g@yandex.ruFel'dmanE. B.

Academician Semenov avenue 1, Chernogolovka 142432, Moscow Region

Vasil'evS. G.

Academician Semenov avenue 1, Chernogolovka 142432, Moscow Region

Institute of Problems of Chemical Physics of Russian Academy of SciencesRussian Federation20161712201618216202 (6 pp.)Copyright © Bochkin G.A., Fel'dman E.B., Vasil'ev S.G., 20242024Bochkin G.A., Fel'dman E.B., Vasil'ev S.G.Bochkin G.A., Fel'dman E.B., Vasil'ev S.G.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/117

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.

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The authors declare that there are no conflicts of interest present.