Abstract
Recent discovery of a method of producing a region of homogeneous magnetic field remotely, combined with the recent detection of NMR in samples external to the nuclear magnetic resonance coil, led to this report of the detection of NMR from a remotely produced toroidal region external to the coil. Using a modified 4-in. laboratory electromagnet, a toroidal region of homogeneous radial magnetic field 28 cm in diameter with a field strength of 117.5 G was produced. Proton NMR signals were detected from a variety of coaxially located NMR coils of 15-, 18-, 20-, and 24-cm diameter. The data suggest an inverse fifth-power dependence of signalto-noise ratio on r a , the ratio of sample-to-coil radii. Correction for sample volume dependence on R results in an inverse square dependence of S/N on R when a is fixed.
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