By Roderick E. Wasylishen, Sharon E. Ashbrook, Stephen Wimperis
The content material of this quantity has been extra to eMagRes (formerly Encyclopedia of Magnetic Resonance) - the final word on-line source for NMR and MRI.
Over the previous twenty years technical advancements in superconducting magnet know-how and instrumentation have elevated the opportunity of NMR spectroscopy in order that it truly is now attainable to review a variety of stable fabrics. furthermore, it is easy to probe the nuclear environments of many different extra atoms that own the valuables of spin. specifically, it really is attainable to hold out NMR experiments on isotopes that experience nuclear spin higher that ½ (i.e. quadrupolar nuclei). on the grounds that extra that two-thirds of all NMR energetic isotopes are quadrupolar nuclei, functions of NMR spectroscopy with quadrupolar nuclei are expanding rapidly.
The goal of this instruction manual is to supply lower than a unmarried hide the elemental rules, concepts and functions of quadrupolar NMR because it relates to sturdy fabrics. every one bankruptcy has been ready through a professional who has made major contributions to out figuring out and appreciation of the significance of NMR reports of quadrupolar nuclei in solids. The textual content is split into 3 sections: the 1st offers the reader with the history essential to savour the demanding situations in buying and studying NMR spectra of quadrupolar neclei in solids. the second one provides state of the art recommendations and method for making use of those recommendations to enquire quadrupolar nuclei in solids. the ultimate part explores functions of solid-state NMR experiences of solids starting from investigations of dynamics, characterizations of organic samples, natural and inorganic fabrics, porous fabrics, glasses, catalysts, semiconductors and high-temperature superconductors.
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Extra resources for NMR of Quadrupolar Nuclei in Solid Materials
Such a passage is materialized by a slow sweep of ν0 , which can in turn be done by sweeping of the carrier frequency or of the magnetic ﬁeld. Another possibility is the sweeping of νQ . Because of its orientation dependence, the quadrupolar splitting can easily be varied by simply turning the sample. The passage is adiabatic if the change in νQ is sufﬁciently slow for the condition α > 1 to be satisﬁed, with the adiabaticity parameter deﬁned as α = ωnut 2 /(dωQ /dt). Magic-angle spinning (MAS) is a particularly effective method for νQ sweeping, since νQ of any crystallite experiences two or four zero-crossings per rotation cycle.
2. 10. 14 The angles θ and φ are not the polar angles of the z axis in (x, y, z). RELATED ARTICLES IN THE ENCYCLOPEDIA OF MAGNETIC RESONANCE Average Hamiltonian Theory Double Rotation High Speed MAS of Half-Integer Quadrupolar Nuclei in Solids Internal Spin Interactions and Rotations in Solids Quadrupolar Interactions 15 Line Narrowing Methods in Solids 12. G. E. , S. A. Feller, and P. J. Bray, J. Magn. , 1977, 27, 121. Magic Angle Spinning: Effects of Quadrupolar Nuclei on Spin-1/2 Spectra 13.
Doane, in Magnetic Resonance of Phase Transitions, eds. F. J. Owens, C. P. , and H. A. Farach, Academic Press, New York, 1979. 39. D. M. Brink and G. R. , Clarendon Press, Oxford, 1968, p. 51. Chapter 2 Quadrupolar Nuclei in Solids Alexander J. 1 Introduction Basic Spin Properties Interaction with Radiofrequency Fields Experimental Methods Theory References 17 18 25 29 36 43 INTRODUCTION Nuclei with spin quantum number I 1 have an electric quadrupole moment that couples with the inhomogeneous internal electric ﬁelds existing in molecules and solids.