FIELD: physics.
SUBSTANCE: invention is used to study the structure and properties of diamagnetic substances by nuclear magnetic resonance spectroscopy. The essence of the invention lies in the fact that the method of obtaining a two-dimensional correlation spectrum of chemical shifts of NMR signals with high resolution is based on spontaneous coherent mixing of spins of any pairs of magnetic nuclei with spin 1/2 in an ultraweak magnetic field. To obtain such a two-dimensional spectrum, the stages of preparation, evolution, and detection are carried out in a strong magnetic field of an NMR spectrometer, and coherent mixing of the spins of nuclei with different gyromagnetic ratios under the action of scalar interaction between these nuclei occurs spontaneously, under conditions of strong coupling between these nuclei in an ultra-weak field, in as a result of nonadiabatic switching of the magnetic field strength from strong to ultraweak.
EFFECT: invention is aimed at providing possibility of obtaining a two-dimensional high-resolution NMR spectrum, which gives a complete map of the correlations of chemical shifts of NMR signals for any pairs of magnetic nuclei with spin 1/2 with a different gyromagnetic ratio in the composition of an individual substance and thus revealing signals from an individual compound in the complex NMR spectrum of a multicomponent system of various substances.
5 cl, 6 dwg
