Circularly Polarized RF Magnetic Fields for Spin-1 NQR
J. B. Miller,
B. H. Suits, A. N. Garroway
Abstract
The low sensitivity of nuclear quadrupole resonance (NQR) of
powders is due, in part, to the inability to efficiently excite
and detect nuclei at all crystal orientations. Here we
describe the use of circularly polarized RF magnetic fields
for excitation followed by detection of the resultant circular
RF magnetization in I = 1 NQR to increase
the fraction of nuclei excited and detected. We show that
the technique can greatly improve the effective RF field
homogeneity and increase the largest signal amplitude
by a factor of 1.72. In favorable cases, the resulting
circularly polarized NQR signal can be separated from
linearly polarized magnetoacoustic and piezoelectric ringing artifacts
that occur in some NQR materials detection applications.
Journal of Magnetic Resonance 151, 228-234 (2001).
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