FIELD: study of structure and composition of chemical constitutions. SUBSTANCE: method includes two-frequency pulse action on two junctions having common energy level, change of duration of pumping pulse across one of junctions and recording of echo signal across other junction. Duration of pulse on observed junction is changed simultaneously with change of duration of pumping pulse. Amplitudes of radio frequency fields are established so that simultaneous inversion of pollution of both pairs of levels corresponds to the same variable duration of pulses on both excited junctions. EFFECT: higher efficiency. 3 cl, 3 dwg
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