Magnetic field stabilizer for a multipulse nuclear magnetic resonance spectrometer

A pulse stabilizer of magnetic field based on magnetic resonance of 7Li nuclei and used for stabilization of electromagnetic field of NMR multipulse spectrometer is described. The stabilizer provides instability of field <=10-6. Stabilization coefficient equals 30. Operation of the considered stabilizer is based on the fact that the signal of NMR, free induction drop is changed a phase when passing through resonance. MNR sensor constructed by one-coil circ.uit is a sensitive element of the described flow sheet. Saturated LiCl solution in formamide is a working sample. Time of spin-lattice 7Li nuclei relaxation of the sample is about 50 ms. The described stabilizer has been used in combination with NMR spectrometer intended for 1H and 19F nuclei investigation at 57 MHz frequency