Multinuclear Solid-State Nuclear Magnetic Resonance of by Kenneth J.D. MacKenzie

By Kenneth J.D. MacKenzie

Options of sturdy country nuclear magnetic resonance (NMR) spectroscopy are always being prolonged to a extra assorted variety of fabrics, urgent into carrier an ever-expanding diversity of nuclides together with a few formerly thought of too intractable to supply usable effects. whilst, new advancements in either and software program are being brought and sophisticated. This booklet covers crucial of those new developments.

With sections addressed to non-specialist researchers (providing obtainable solutions to the commonest questions on the idea and perform of NMR requested through beginners) in addition to a extra specialized and up to date remedy of crucial parts of inorganic fabrics study to which NMR has program, this publication will be helpful to NMR clients no matter what their point of craftsmanship and no matter what inorganic fabrics they need to study.

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The precession of the magnetisation in the rotating frames for 90~ and 180~pulses (assuming that ~ is positive). 41) These operators induce transitions between different spin states so that by applying an if-field to nuclear spins in the presence of a large static magnetic field close to the Larmor frequency, the spin distribution between the energy levels is perturbed away from thermodynamic equilibrium. In pulsed NMR experiments the spin system is excited with a short rf pulse near resonance and the system is measured afterwards.

The information about the atomic scale surroundings of a nucleus is contained within the interactions between the nucleus and those surroundings. These interactions are summarised in the internal Hamiltonian H~nt -- H D + Hcs + H K + Hj + Hp + HQ ~1) + HQ ~2) + - . 44) In diamagnetic insulating solids spin-1/2 nuclei experience a range of interactions that include magnetic dipolar (HD), interaction through space with nearby nuclear magnetic moments, chemical shielding (Hcs), modification of the magnetic field at the nucleus due to the surrounding electrons and indirect spin-spin coupling (Hj), interaction of nuclear magnetic moments mediated by intermediate electron spins.

1988). High-resolution solid state NMR is dealt with by Haeberlen (1976) and Mehring (1983). A book devoted to pulsed solid state NMR has been written by Gerstein and Dybowski (1985). Although 13C NMR of organic materials is not dealt with in the present book, there is ample literature on this subject, including the books by Stejskal and Memory (1994) and Fyfe (1983), the latter providing numerous applications of 13C NMR. Schmidt-Rohr and Spiess (1996) present a comprehensive background to modem NMR techniques for characterising solid polymeric materials.

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