NMR Imaging Using Second Order Quadrupole Broadened Resonances

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Theoretical and experimental results for NMR imaging measurements of powdered materials using the +1/2 to -1/2 transition of -1/2-integer spin nuclei in the presence of a very large second-order electric quadrupolar broadening are presented. An "effective spin-1/2" formalism is developed to account for additional effects due to the presence of quadrupolar interactions comparable in size to the Zeeman interaction. A large (7.9 mT/cm-A, with a maximum current of ≈20 A), rapid (≈30 μs) pulsed linear gradient field is used with echoes and phase encoding techniques to obtain images in the limit γH1 is much narrower than the NMR linewidth. A one-dimensional projection of the second-order quadrupolar perturbed, 4-MHz-wide, +1/2 ↔ -1/2 transition for 63Cu in Cu2O powder is presented as an example. An experimental one-dimensional projection of a sample containing Cu2O and YBa2Cu3O6.7 is also presented. © 1998 Academic Press.

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Journal of Magnetic Resonance