NMR Imaging Using Second Order Quadrupole Broadened Resonances
V. Srirama Swaminathan and B. H. Suits
Abstract
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 20A), rapid (30 us) pulsed linear gradient field
is used with echoes and phase encoding techniques to obtain images
in the limit gamma-H1 is much narrower than the
NMR linewidth. A one-dimensional projection of the
second-order quadrupolar perturbed, 4-MHz-wide,
+1/2 to -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.
Journal of Magnetic Resonance 132, 274-278 (1998).
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