 1  Author
 N. Sinyavsky, M. Maćkowiak, N. Velikite  Requires cookie*   Title
 Influence of the rf Field Inhomogeneity on Nutation NQR Spectra of Spin 3/2 Nuclei in Powders    Abstract
 The influence of the rf field inhomogeneity on the NQR nutation spectra of spin / = 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 spectrum with a function of the rf field distribution, is used. The method is successfully demonstrated for simulated and experimental NQR nutation spectra of 35 C1 in TiCl 4 . The lineshape analysis of reconstructed nutation spectra allowing the determination of the EFG asymmetry parameter is given. The real advantage of the proposed method is that the highresolution nutation spectrum may be obtained for a sample filling up the entire coil.   
Reference
 Z. Naturforsch. 54a, 153—158 (1999); received November 24 1998   
Published
 1999   
Keywords
 Nuclear Quadrupole Resonance, 2D Nutation Spectroscopy, Electric Field Gradient Tensor   
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2  Author
 N. Velikite, N. Sinyavsky, M. Maćkowiak  Requires cookie*   Title
 Lineshape Analysis of 2D NMR and NQR Nutation Spectra of Integer and HalfInteger Quadrupolar Nuclei    Abstract
 A lineshape analysis of the NMR and NQR powder nutation spectra of integer and halfinteger quadrupolar nuclei is presented. Simulated NMR nutation spectra of spin I = 1 and 3 nuclei are reported. For / = 1 the formulas for the singularities of the NMR nutation powder patterns as a functions of rj, e 2 Qq and 7B x are given. The NQR nutation powder patterns for spin / = 3/2, 5/2, 7/2, and 9/2 for different induced transitions are calculated, and some experimental aspects of the method are discussed. A universal empirical formula to facilitate the determination of the asymmetry parameter from the NQR nutation frequency singularities for any arbitrary spin or transition is found. The NQR nutation spectra for halfinteger and integer spins are compared. For integer spins the twofrequency excitation of the nutation spectrum is analysed. Application of the 2Dnutation lineshape analysis for the determination of the quadrupole interaction parameters is emphasised.   
Reference
 Z. Naturforsch. 54a, 351—357 (1999); received April 9 1999   
Published
 1999   
Keywords
 2D Nutation Spectroscopy, NQR, NMR, Electric Field Gradient Tensor   
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3  Author
 Mariusz Maćkowiak, Piotr Kątowski  Requires cookie*   Title
 2D OffResonance Nutation NQR Spectroscopy of Spin 3/2 Nuclei    Abstract
 The effects of offresonance irradiation in nutation NQR experiments are demonstrated both experimentally and theoretically. The theoretical description of the offresonance effects in 2D nutation NQR spectroscopy is given, and general exact formulas for the asymmetry parameter are obtained. It is shown that the outcome of the offresonance nutation experiments depends on the data acquisition procedure, leading to oneor threeline nutation spectra. To explain this fact and to describe the offresonance nutation experiment properly, the transient response theory of a quadrupolar spin system to an RF pulse was modified using the wavefunction approach. The 2D separation of interactions technique has been applied to separate a static and a randomly timefluctuating dynamic part of the quadrupole interaction in the antiferroelectric phase of polycrystalline ammonium dihydrogen arsenate. Twodimensional offresonance nutation NQR spectroscopy has been used to determine the full quadrupolar tensor of spin3/2 nuclei in several molecular crystals containing the 35 C1 and 75 As nuclei. The offresonance phenomena in 2D NQR are very important from the practical point of view (determination of r\ in multiple or broadline spectrum) and also provide interesting information on the dynamic properties of a quadrupolar spin system.   
Reference
 Z. Naturforsch. 53a, 285—292 (1998); received January 26 1998   
Published
 1998   
Keywords
 Nuclear Quadrupole Resonance, 2D Nutation Spectroscopy, Offresonance Irradiation, Electric Field Gradient Tensor   
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