Influence of the rf field inhomogeneity on nutation NQR spectra of spin 3/2 nuclei in powders

The influence of the rf field inhomogeneity on the NQR nutation spectra of spin I = 3/2 nuclei in powder samples is investigated. To eliminate the rf field inhomogeneity effects, a method of reconstruction of the NQR nutation spectra, based on finding the deconvolution of the Fourier nutation spectr um with a function of the rf field distribution, is used. The method is suc cessfully demonstrated for simulated and experimental NQR nutation spectra of Cl-35 in TiCl4. The lineshape analysis of reconstructed nutation spectra allowing the determination of the EFG asymmetry parameter is given. The re al advantage of the proposed method is that the high-resolution nutation sp ectrum may be obtained for a sample filling up the entire coil.