Spin 3/2 Zeeman perturbed NQR in the presence of slow sample rotation
R. P. Panguluri and B. H. Suits
Abstract
Theoretical and experimental results are presented for the case of
Zeeman perturbed nuclear quadrupole resonance (NQR) using spin-3/2
nuclei with a small Zeeman interaction, gamma-B0, while the
sample is very slowly rotated. It is found that the decay envelope for
a simple two-pulse echo measurement can be strongly affected even though the
sample may rotate only a few degrees or less during the course of
the measurement. To lowest order the decay envelope can be described
using a one dimensional function of the product of gamma-B0,
the roatation rate, and the square of the pulse spacing. Aside from
an indirect and weak dependence on the quadrupole asymmetry paraneter, eta,
the result is independent of the NQR freqnecy. Identical results are expected
for a stationary sample in a small rotating magnetic field. The effect
seen here may be used to advantage to measure rotational motion, for
example of particles in fluids, or may be an additional complication
for some Zeeman perturbed NQR measurements, including some NQR detection
and imaging methods.
Journal
of Magnetic Resonance, 182, 49-54 (2006).
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