Multidimensional NQR: Imaging and Exchange Spectroscopy*
نویسنده
چکیده
In this context a "dimension" can be of a spatial or of a spectroscopic nature. In the last two decades, multidimensional nuclear magnetic resonance and imaging have proven to be most useful tools for the investigation of materials. It turned out that some of these measuring principles can be applied to zero-field N Q R as well. The purpose of this presentation is to elucidate twodimensional exchange spectroscopy and imaging procedures suitable for NQR and to outline potential applications.
منابع مشابه
Multidimensional NQR Spectroscopy — A New Tool in Studies of Molecular Dynamics
Two-dimensional exchange Cl nuclear quadrupole resonance spectroscopy for studies of the CCl3-group reorientation processes in hexachloroethane and chloral hydrate has been applied. Experimental results were interpreted on the basis of the 2D exchange nuclear quadrupole resonance theory, which takes into account the off-resonance irradiation. It has been demonstrated that 2D nuclear quadrupole ...
متن کاملTwo-dimensional Exchange Spectroscopy Using Pure NQR*
Exchange between positions with different resonance frequencies can be studied by two-dimensional spectroscopy originally developed for the NMR case. Cross intensity reflects changes of the resonance frequency due to different line shifts or anisotropic interactions. We now present analogous experiments carried out with pure NQR of polycrystalline samples. The specific requirements are discusse...
متن کاملStudy of As-Sb-Se chalcogenide glasses by NQR and EPR spectroscopy methods
In this paper experimental results obtained by both 75As NQR and EPR spectroscopy are presented for the three-component system As-Sb-Se. The 75As NQR spectra of glasses of structures (As2Se3)0.78(Sb2Se3)0.22, (As2Se3)0,75(Sb2Se3)0.25, (As2Se3)0.5(Sb2Se3)0.5 have broad lines with two Sb-NQR lines (corresponding to the Sb2Se3 units) and two 75As-NQR lines (corresponding to the As2Se3 units). Diff...
متن کاملRecent Fourier and Laplace perspectives for multidimensional NMR in porous media.
Multidimensional NMR techniques used in the measurement of molecular displacements, whether by diffusion or advection, and in the measurement of nuclear spin relaxation times are categorised. Fourier-Fourier, Fourier-Laplace and Laplace-Laplace methods are identified, and recent developments discussed in terms of the separation, correlation and exchange perspective of multidimensional NMR spect...
متن کامل2D Off-Resonance Nutation NQR Spectroscopy of Spin 3/2 Nuclei*
The effects of off-resonance irradiation in nutation NQR experiments are demonstrated both experimentally and theoretically. The theoretical description of the off-resonance 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 off-resonance nutation experiments depends on the data acquisition p...
متن کامل