Relaxation-allowed nuclear magnetic resonance transitions by interference between the quadrupolar coupling and the paramagnetic interaction

Wen Ling, Alexej Jerschow

Research output: Contribution to journalArticle

Abstract

Of the various ways in which nuclear spin systems can relax to their ground states, the processes involving an interference between different relaxation mechanisms, such as dipole-dipole coupling and chemical shift anisotropy, have become of great interest lately. The authors show here that the interference between the quadrupolar coupling and the paramagnetic interaction (cross-correlated relaxation) gives rise to nuclear spin transitions that would remain forbidden otherwise. In addition, frequency shifts arise. These would be reminiscent of residual anisotropic interactions when there are none. While interesting from a fundamental point of view, these processes may become relevant in magnetic resonance imaging experiments which involve quadrupolar spins, such as Na23, in the presence of contrast agents. Geometrical constraints in paramagnetic molecule structures may likewise be derived from these interference effects.

Original languageEnglish (US)
Article number064502
JournalJournal of Chemical Physics
Volume126
Issue number6
DOIs
StatePublished - 2007

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Chemical shift
Magnetic resonance
Ground state
Contrast Media
Anisotropy
Nuclear magnetic resonance
interference
Imaging techniques
nuclear spin
nuclear magnetic resonance
Molecules
dipoles
cross relaxation
Experiments
interactions
frequency shift
chemical equilibrium
magnetic resonance
anisotropy
ground state

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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AU - Jerschow, Alexej

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AB - Of the various ways in which nuclear spin systems can relax to their ground states, the processes involving an interference between different relaxation mechanisms, such as dipole-dipole coupling and chemical shift anisotropy, have become of great interest lately. The authors show here that the interference between the quadrupolar coupling and the paramagnetic interaction (cross-correlated relaxation) gives rise to nuclear spin transitions that would remain forbidden otherwise. In addition, frequency shifts arise. These would be reminiscent of residual anisotropic interactions when there are none. While interesting from a fundamental point of view, these processes may become relevant in magnetic resonance imaging experiments which involve quadrupolar spins, such as Na23, in the presence of contrast agents. Geometrical constraints in paramagnetic molecule structures may likewise be derived from these interference effects.

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