Download e-book for iPad: High Resolution NMR Spectroscopy in Solids by Professor Dr. Michael Mehring (auth.)

By Professor Dr. Michael Mehring (auth.)

ISBN-10: 3642963323

ISBN-13: 9783642963322

ISBN-10: 364296334X

ISBN-13: 9783642963346

Manipulation and Dilution instruments for Ruling ample Species "NMR is lifeless" used to be the slogan heard within the past due Sixties at the very least between physicists, until eventually John S. Waugh and his co-workers initiated a chain of recent NMR experiments, which hired the coherent modulation of interactions via robust radiofrequency fields. A wealth of latest phenomena was once saw, that are summarized within the advent for the benefit of the independent reader, while part 2 collects the elemental spin interactions saw in solids. Line-narrowing results in dipolar coupled solids by way of the appliance of a number of­ pulse experiments are broadly mentioned in part three. various extensions of the elemental Waugh, Huber, and Haeberlen scan were constructed by means of assorted teams and feature been utilized to the nuclei IH, 9Be, 19F, 27Al, 31p, 63CU in solids. software of this method to quite a few platforms remains to be in growth and may exhibit attention-grabbing insights into susceptible spin interactions in solids. It used to be quickly discovered that infrequent spins will be used as displays for molecular fields within the sturdy kingdom; in spite of the fact that, infrequent spin commentary is tough a result of small signal-to-noise ratio. Pines, Gibby, and Waugh brought a brand new notion of cross-polarization, in response to principles of Hahn and associates, which permits the detection ofrare spins with elevated sensitivity. The dynamics concerned are handled intimately. different sections in basic terms checklist effects bought by means of the concepts defined and show their usefulness within the research of dynamical difficulties in molec­ ular and stable country physics.

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A-I. 92) and E is a kx k unit matrix. Q. However, the singularities in Eq. 91) may cause severe problems, when calculating powder spectra numerically. Fake spikes and peaks may occur in the powder spectrum which have no physical Significance. On the other hand, the calculation of spectra according to Eq. 91) may become very time consuming even on a fast digital computer. 93) where 'Aij == 'A/Jij is the eigenvalue matrix. Ifwe start from Eq. Q) == Re{W. S· Jexp[('A - iwE)t']dt' . S-I. Q) = Re ~ I (W: S);(S-I.

0 160 180 (DEGREES) Fig. 4. Chemical shift of '9F in solid CF 3COOAg at T = 300 oK versus the goniometer rotation angle, as obtained in a multiple-pulse experiment (WHH-4). The labels a, b, c* refer to the mutually orthogonal crystallografic axes (see Ref. [7]) motion of the CF 3-group at room temperature. Rotation of the single crystal was performed around three different axes closely related to the unit cell axes. The principal components and the principal axes of the shielding tensor were evaluated by Griffin et al.

L Xl! n! I " G (t) = f (-it)n (Ix IJC7Ip(0)) x n=O n!. 21) together with Eqs. 22b) which are the familiar second and fourth moment [10]. t -+ .... 23) Higher order moments are usually difficult to evaluate, although in the case of a simple cubic lattice all moments up to the eighth moment have been calculated. But in most cases just the second and fourth moment are known. Since the moment expansion does not converge rapidly, the second and fourth moment describe only the very beginning of the decay function GAt).

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High Resolution NMR Spectroscopy in Solids by Professor Dr. Michael Mehring (auth.)

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