Albannay, Mohammed M., Joachim M. O. Vinther, Jan Raagaard Petersen, Vitaliy Zhurbenko, and Jan Henrik Ardenkjaer-Larsen. “Compact, Low-Cost NMR Spectrometer and Probe for Dissolution DNP.” Journal of Magnetic Resonance, April 25, 2019.
The desire for higher magnetic resonance sensitivity has led to the development of multiple home-built and commercial dissolution dynamic nuclear polarization polarizers. The emergence of polarizers capable of variable magnetic field strengths desires a versatile standalone spectrometer and NMR circuit to fulfill detection needs at different frequencies. We present a benchtop NMR spectrometer with duplexer capable of serving high-field solid and liquid state NMR applications up to 450 MHz. A detailed view of the employed probe is discussed. Tuning and matching schemes are investigated yielding and experimentally verifying closed-form equations to estimate nutation frequency for a remotely tuned and matched sample coil.