Nuclear spin relaxation in systems of magnetic spheres

A new approach to the NMR relaxation theory for a system of magnetic spheres (sufficiently big spherical molecules) is presented. In this paper the NMR spin–lattice relaxation time T 1 and spin–spin relaxation time T 2 are calculated for nuclear spins I → j, taking into account intermolecular dipole...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2003-05, Vol.328 (3), p.302-311
Main Authors: Blicharski, J.S., Kruk, D., Macri, M.A., Maraviglia, B.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diffusion
Exact sciences and technology
Macromolecules
Magnetic resonances and relaxations in condensed matter, mössbauer effect
NMR relaxation
Nuclear magnetic resonance and relaxation
Physics
Relaxation effects
Solution
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Summary:A new approach to the NMR relaxation theory for a system of magnetic spheres (sufficiently big spherical molecules) is presented. In this paper the NMR spin–lattice relaxation time T 1 and spin–spin relaxation time T 2 are calculated for nuclear spins I → j, taking into account intermolecular dipole–dipole interactions between the spins I → j, and spins S → k in the magnetic spheres. By an expansion of the dipole–dipole interaction in a series of spherical harmonics, it is possible to separate spatial variables of the interacting spins in a laboratory frame. A simultaneous effect of isotropic rotational and translation diffusion of the spins and relaxation rate of spins S → k is also taken into account.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(02)01854-9