Criteria for multiexponential relaxation of exchanging spin- 3 2 nuclei

Uzi Eliav*, Gil Navon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The validity of the analytical expressions to the problem of NMR relaxation of spin- 3 2 nuclei, based on the second-order perturbation theory, is examined by comparison to numerical solution of the Lionville equation. It is shown that for a slowly rotating site, although relaxation may be well fitted to biexponential decay, second-order perturbation theory does not give the correct values for the decay rates unless κ ≤ 1, with κ = ( χ ω0)20τR, in which X and TR are the quadrupole interaction and the reorientation time, respectively. The above criterion is also examined for relaxation of spins that exchange between slow and fast rotating sites. Relaxation processes with reorientation times longer than the exchange times are also considered. Analytical expressions are given for the longitudinal relaxation of a system with exchanging sites at any concentration ratio.

Original languageEnglish
Pages (from-to)223-240
Number of pages18
JournalJournal of Magnetic Resonance (1969)
Volume88
Issue number2
DOIs
StatePublished - 15 Jun 1990

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