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On the theory of double quantum NMR in polymer systems: The second cumulant approximation for many spin i = 1/2 systems
Authors
Fatkullin N.
Mattea C.
Stapf S.
Publication date
1 January 2013
Publisher
Abstract
General analytical expressions for Double Quantum Nuclear Magnetic Resonance (DQ NMR) kinetic curves of many-spin I = 1/2 systems are derived with an accuracy of the second cumulant approximation. The expressions obtained exactly describe the initial part of the kinetic curves and provide a reasonable approximation up to times of about the effective spin-relaxation time. For the case when the system contains two isolated spins, this result exactly reproduces known expressions. In the case of polymer melts, the intermolecular magnetic dipole-dipole interactions significantly influence the time dependence of the DQ NMR kinetic curves. © 2013 AIP Publishing LLC
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Last time updated on 07/05/2019