Journal ArticleDOI
Nonexponential Nuclear Magnetic Relaxation by Quadrupole Interactions
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TLDR
In this paper, it was shown that the nuclear magnetic relaxation of the longitudinal and transverse components of a spin I are different, but each is the sum of I decaying exponential terms if I is an integer, or the sum I + ε+ ε−12 decaying exponential term if I was half an odd integer, if the relaxation is produced by quadrupole interactions for which the correlation time is not short compared to the Larmor period.Abstract:
Results are presented of calculations showing that the nuclear magnetic relaxation of the longitudinal and transverse components of a spin I are different, but each is the sum of I decaying exponential terms if I is an integer, or the sum of I + 12 decaying exponential terms if I is half an odd integer, if the relaxation is produced by quadrupole interactions for which the correlation time is not short compared to the Larmor period. Expressions for the exponents and coefficients are given in detail for the case I = 32. If the correlation time is short, the expressions reduce to the simple exponential decays calculated by previous investigators.read more
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The structure of micelles and microemulsions
Yves Chevalier,Thomas Zemb +1 more
TL;DR: In this paper, the basic general constraints controlling surfactant aggregation and the formation of interfaces are summarized and related to interfacial film properties and the intermolecular interactions inside them.
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Multiple‐quantum NMR spectroscopy of S=3/2 spins in isotropic phase: A new probe for multiexponential relaxation
TL;DR: In the absence of splittings, the motional correlation times τc are comparable to or larger than the inverse of the Larmor frequency (violation of the extreme narrowing approximation) as discussed by the authors.
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Sodium MRI using a density-adapted 3D radial acquisition technique
Armin M. Nagel,Frederik Bernd Laun,Marc-André Weber,Christian Matthies,Wolfhard Semmler,Lothar R. Schad +5 more
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Spectral densities and nuclear spin relaxation in solids
TL;DR: In this paper, the properties of ten spectral densities relevant for nuclear spin relaxation studies in solids are investigated and a brief review of the appropriate spin-dependent interactions and the various relaxation rates which can be measured is discussed.
References
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Journal ArticleDOI
Quantum-Mechanical and Semiclassical Forms of the Density Operator Theory of Relaxation
TL;DR: In this article, a density operator relaxation theory for nuclear magnetic relaxation was proposed. But it is only applicable when the spin energy depends explicity on time, and it cannot predict correctly the observed density operator.
Journal ArticleDOI
Nonexponential Relaxation of Rotating Three‐Spin Systems in Molecules of a Liquid
TL;DR: The longitudinal and transverse nuclear magnetic relaxation of a system of three identical spin-12 nuclei at the corners of an equilateral triangle with respect to a molecule which undergoes rotational Brownian motion has been calculated on the assumption that the relaxation is due to dipole-dipole interactions between the three nuclei as discussed by the authors.