REGENERATIVE HIGH-RESOLUTION NMR SPECTROSCOPY.

A description is given of a high-resolution NMR spectrometer in which the signal sensor is a sideband spin generator working in multiple-frequency mode. A method is considered for adjusting and monitoring the phase shift in the feedback circuit of this generator with an error of 10** minus **3 rad, which provides for measuring spectral intervals in excess of 10 Hz with an error not more than 10** minus **4 Hz for NMR linewidths of 0. 2 Hz. A method is also given for suppressing the parasitic modulation that occurs when there is inhomogeneous broadening of the NMR line of the working specimen. The spectrometer also allows one to measure the longitudinal-relaxation time T//1.