A new double-tuned probed for concurrent 1H and 31P NMR☆

Abstract A new method for double tuning NMR probes, utilizing a parallel LC trap in series with the usual tuning capacitor, is described. This method of probe tuning provides both resonances to a single input, creating an ideal probe for concurrent 31 P and 1 H NMR. The sensitivity of this probe at 31 P is not appreciably different from single-tuned probes. This circuit design has the advantages of requiring fewer reactive components and is easily generalized to more than two resonances.