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"Rotating-Frame NMR Microscopy Using Toroid Cavity
Detectors"
K. Woelk, J.
W. Rathke, and R. J. Klingler, J. Magn. Reson. A 105,
113-116 (1993).
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A toroid cavity resonator is shown to provide a sufficiently strong and
accurate B1 field gradient for achieving
the highest spatial resolution with the RFI (rotating frame imaging) technique
as of this date.
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Two Teflon layers with a separation of 20 µm were easily resolved
by 19F-NMR spectroscopy in a set of conventional
single pulse experiments.
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As demonstrated with five equally spaced sample capillaries containing
three different solvents, chemical shift and distance information is simultaneously
obtained from a two-dimensional Fourier transformation of time and pulse
width domain data, respectively.
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Theoretical evaluation suggests that the maximum spatial resolution of
the described toroid detector is 6.5 µm. Avenues for further enhancement
of distance resolution are discussed.
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K. Woelk, October
19, 1998