Abstract
A theory of the high resolution NQR spectroscopy experiments is developed in the framework of an average Hamiltonian approach analogous to that used in the theory of the NMR line pulse narrowing in solids. A specially constructed unitary operator is found making it possible to treat r. f. excitation of spin systems with nonequidistant spectra, spin and EFG asymmetry parameter being arbitrary. Time averaging is used to get an average Hamiltonian appropriate to dealing with arbitrary periodic multiple-pulse sequences. Relations between the sequence parameters are found ensuring realization of the averaging above mentioned in different cases of interest. The theoretical results obtained are consistent with available data on NQR multiple-pulse experiments.
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