Email this article Relaxation of multiple-quantum coherences in dipolar coupled 1H spin pairs in gypsum
- Authors: Fel’dman Е.B.1, Kuznetsova E.I.1, Fedorova A.V.1, Panicheva K.V.1,2, Vasil’ev S.G.1, Zenchuk A.I.1
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Affiliations:
- Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences
- Lomonosov Moscow State University
- Issue: Vol 88, No 7 (2024)
- Pages: 1089-1098
- Section: Spin physics, spin chemistry and spin technologies
- URL: https://journal-vniispk.ru/0367-6765/article/view/279539
- DOI: https://doi.org/10.31857/S0367676524070147
- EDN: https://elibrary.ru/PAVTXY
- ID: 279539
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Abstract
The evolution and relaxation of MQ NMR coherences on the preparation period were investigated experimentally on a single crystal of gypsum, CaSO4·2H2O. The theory describing the dynamics of MQ coherences on the preparation period of MQ experiment for a pair of spins was developed based on the Lindblad master equation. This theory predicts the appearance of MQ coherences of only zeroth and second orders, oscillatory exchange of their intensities and exponential decay with increasing of the preparation time. The proposed theory describes the experimental data well. It is shown that the frequency of oscillations depends on the orientation of the crystal in the external magnetic field and determined by the dipolar coupling between protons of the water molecules contained in the gypsum crystal. The relaxation time of MQ coherences of zeroth and second orders, Tr= 150±15 μs, were independent of the crystal orientation, which suggest a common source of relaxation due to the dipole-dipole interactions with protons surrounding water molecule.
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About the authors
Е. B. Fel’dman
Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences
Email: svasilev@icp.ac.ru
Russian Federation, Chernogolovka
E. I. Kuznetsova
Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences
Email: svasilev@icp.ac.ru
Russian Federation, Chernogolovka
A. V. Fedorova
Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences
Email: svasilev@icp.ac.ru
Russian Federation, Chernogolovka
K. V. Panicheva
Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences; Lomonosov Moscow State University
Email: svasilev@icp.ac.ru
Russian Federation, Chernogolovka; Moscow
S. G. Vasil’ev
Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences
Author for correspondence.
Email: svasilev@icp.ac.ru
Russian Federation, Chernogolovka
A. I. Zenchuk
Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences
Email: svasilev@icp.ac.ru
Russian Federation, Chernogolovka
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