FIELD: study of structure and composition of chemical compounds, development of various radio physical and radio engineering systems and devices based on interaction of substance with radio frequency field. SUBSTANCE: method of observation of signals of quadrupole spin echo includes action on sample carrying quadrupole nuclei with radio frequency pulses with time interval between them and basic frequency equal to resonance frequency ω(i)
Q
of excited transition, recording of signals on this frequency and additional action with radio frequency pulses with basic frequency equal to ω(i)
Q
± Δω(i)
Q
, where Δω(i)
Q
is amount off resonance frequency of excited transition within bounds of halfwidth of line of nuclear quadrupole resonance. Radio frequency pulses having various basic frequencies are fed by different methods. EFFECT: invention makes it feasible to excite resonance transitions with wide lines of nuclear quadrupole resonance, to obtain additional information on structure and composition of chemical compounds whose study was impeded before. 4 cl, 8 dwg
