High-Q, continuous-wave spectrometers for low temperature conductor systems

The development of NMR spectroscopic techniques was pushed significantly forward with the development of broad-band, pulsed-RF spectrometers aided by the Fast Fourier Transform (FFT). To this day, the older techniques using continuous-wave RF spectrometers are seldom used. However, continuous wave techniques may still hold a distinct advantage over pulsed techniques in regimes where the time-integral power delivered to the sample is a significant restriction, namely when performing experiments on low-temperature conductor systems. In such systems, the high-power pulses induce eddy currents which can heat the sample enough to disrupt temperature dependent measurements.