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Enormous field gradients outside of magnet's sweet spot are rarely utilized.
This stray field imaging (STRAFI) probe combines high field of
19.6 Tesla (830 MHz) magnet with large gradients in its fringe
field to obtain high resolution 1D images of layered structures.
Slice selection is achieved by RF coil that moves sample through observation plane.
Stepper-motor driven RF coil
Sample: 10 mm in diameter
Maximum static gradient: 75 T/m
Operating frequency ~520 MHz (12.2 T magnet plane)
Observe nuclei: 1H,
7Li, and
31P.
Achievable layer resolution ~20 micron
...using this intrument
1. E.W. Randall, A.A. Samoilenko and R. Fu, STRAFI Imaging of Paramagnetic Solids: 31P Paramagnetic Displacements, Magn.Reson.Chem. 40 93-95 (2002), PDF
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