High Resolution NMR Spectroscopy in Solids
(Sprache: Englisch)
Manipulation and Dilution Tools for Ruling Abundant Species "NMR is dead" was the slogan heard in the late 1960s at least among physicists, until John S. Waugh and his co-workers initiated a series of new NMR experiments, which employed the coherent...
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Klappentext zu „High Resolution NMR Spectroscopy in Solids “
Manipulation and Dilution Tools for Ruling Abundant Species "NMR is dead" was the slogan heard in the late 1960s at least among physicists, until John S. Waugh and his co-workers initiated a series of new NMR experiments, which employed the coherent modulation of interactions by strong radiofrequency fields. A wealth of new phenomena was observed, which are summarized in the introduction for the convenience of the unbiased reader, whereas Section 2 collects the basic spin interactions observed in solids. Line-narrowing effects in dipolar coupled solids by the application of multiple pulse experiments are extensively discussed in Section 3. Numerous extensions of the basic Waugh, Huber, and Haeberlen experiment have been developed by different groups and have been applied to the nuclei IH, 9Be, 19F, 27Al, 31p, 63CU in solids. Application of this technique to a variety of systems is still in progress and should reveal interesting insights into weak spin interactions in solids. It was soon realized that rare spins could be used as monitors for molecular fields in the solid state; however, rare spin observation is difficult because of the small signal-to-noise ratio. Pines, Gibby, and Waugh introduced a new concept of cross-polarization, based on ideas of Hahn and co-workers, which allows the detection ofrare spins with increased sensitivity. The dynamics involved are treated in detail. Other sections merely list results obtained by the techniques described and demonstrate their usefulness in the investigation of dynamical problems in molec ular and solid state physics.
Inhaltsverzeichnis zu „High Resolution NMR Spectroscopy in Solids “
1. Introduction.- 2. Nuclear Spin Interactions in Solids.- 2.1 Basic Nuclear Spin Interactions in Solids.- 2.2 Spin Interactions in High Magnetic Fields.- 2.3 Transformation Properties of Spin Interactions in Real Space.- 2.4 Powder Spectrum Line Shapes.- 2.5 Specimen Rotation.- 2.6 Rapid Anisotropic Molecular Rotation.- 2.7 Line Shapes in the Presence of Molecular Reorientation.- 3. Multiple-Pulse NMR Experiments.- 3.1 Idealized Multiple-Pulse Sequences.- 3.2 The Four-Pulse Sequence (WHH4).- 3.3 Coherent Averaging Theory.- 3.4 Application of Coherent Averaging Theory to Multiple-Pulse Sequences.- 3.5 Arbitrary Rotations in Multiple-Pulse Experiments.- 3.6 Second Averaging.- 3.7 The Influence of Pulse Imperfection on Multiple-Pulse Experiments.- 3.8 Resolution of Multiple-Pulse Experiments.- 3.9 Magic Angle Rotating Frame Line Narrowing Experiments.- 4. Double Resonance Experiments.- 4.1 Basic Principles of Double Resonance Experiments.- 4.2 Cross-Polarization of Dilute Spins.- 4.3 Cross-Polarization Dynamics.- 4.4 Spin Decoupling Dynamics.- 5. Magnetic Shielding Tensor.- 5.1 Ramsey's Formula.- 5.2 Approximate Calculations of the Shielding Tensor.- 5.3 Proton Shielding Tensors.- 5.4 19F Shielding Tensors.- 5.5 13C Shielding Tensors.- 5.6 Other Shielding Tensors.- 6. Spin-Lattice Relaxation in Line Narrowing Experiments.- 6.1 Spin-Lattice Relaxation in Multiple-Pulse Experiments.- 6.2 Application of Multiple-Pulse Experiments to the Investigation of Spin-Lattice Relaxation.- 6.3 Spin-Lattice Relaxation in Dilute Spin Systems.- 7. Appendix.- A. Irreducible Tensor Representation of Spin Interactions.- B. Rotations.- C. Contribution of Non-Secular Shielding Tensor Elements to the Resonance Shift.- D. Bloch Siegert Shift.- E. General Line Shape Theory.- References.
Bibliographische Angaben
- Autor: M. Mehring
- 2012, Softcover reprint of the original 1st ed. 1976., 248 Seiten, 104 Abbildungen, Maße: 24,4 cm, Kartoniert (TB), Englisch
- Verlag: Springer
- ISBN-10: 364296334X
- ISBN-13: 9783642963346
Sprache:
Englisch
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