Double resonance probe circuit

Figure 7.12. Schematic illustration of the use of a field gradient to differentiate signals from each sample in the multiplex NMR probe. The four coils are wired in parallel in a single resonant circuit. The single-arrowed line indicates the static magnetic field (7.05T). (A) A simulated spectrum of four water samples in the four coils is shown at right for the case of no applied field gradient. AU coils experience the same field, and therefore only one resonance is detected. (B) An applied field gradient (double-arrow line) changes the field experienced by each sample, and thus four resonances are observed.

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