Robinson‐type nuclear quadrupole resonance spectrometer adapted to field‐effect transistors

摘要

A nuclear quadrupole resonance spectrometer, the Robinson circuit adapted with field‐effect transistors, has operated satisfactorily up to 30 MHz with rf levels ranging from 40 mV to 2.6 V peak to peak across the sample coil. The S/N ratio of 14N in hexamethylenetetramin is 85 at room temperature and 150 at 77 K, with a sample volume of 6 cm3 and a time constant of 10 s. The spectrometer is also capable of measuring the spin‐lattice relaxation time by the saturation method.