Multiple tuning NMR probe

Electricity: measuring and testing – Particle precession resonance – Spectrometer components

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324322, G01R 3320

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active

047423048

ABSTRACT:
A multiple tuning NMR probe includes a radio frequency (RF) probe tuned by means of a circuit which creates a multiple pole circuit response in the probe, each of the poles being sufficiently separated from each other as to cause resonance of the probe at distinct frequencies. When tuning for nuclei with resonances substantially apart, this function may be accomplished using a parallel capacitor-inductor (L-C) trap with an impedance matching network. When tuning for nuclei with substantially closely spaced resonances, a tank circuit is used which has a single resonance which is split into two resonances by strongly coupling it to another tank circuit in resonance with the sample coil tank circuit.

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Single Coil Probe w/TL Tuning for NMR Double Resonance V. R. Cross et al., Rev. Sci. Instrum., vol. 47, No. 12, Dec. 1976.
NMR Double Tuned Matching Boxes for Double Resonance FT Exp. on Hydrogen and Fluorine 6 Matson Journal of Mag. Resonance No. 3, Mar. 1977.

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