Use of high mixing frequencies for rf generation and detection in a multinuclear and cross-polarization magic-angle-spinning NMR spectrometer

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Abstract
Use of intermediate frequencies (IFs) above 100 MHz (rather than lower mixing frequencies) in a high‐field multinuclear NMRspectrometer simplifies rf generation and detection, reduces rf filtering requirements, increases the frequency range of the rf synthesizers, and minimizes ’’spurious’’ responses. Simplified rf generation, gating, phase shifting, and detection electronics using 120‐ and 130‐MHz IF’s are described for a 4.7‐T (200 MHz 1H) NMRspectrometer designed for high‐resolution, solid‐state, and multinuclear experiments. The circuitry can be readily modified to function with the highest field (500 or 600 MHz 1H) solenoids available.

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