Publication

Shaped pulses for selective inversion of magnetization in solids spinning at the magic angle

Geoffrey Bodenhausen
1992
Journal Articles

Abstract

In order to achieve selective inversion of a chosen family of sidebands in NMR spectra of solids rotating at the magic angle (MAS spectra), a sequence of so-called DANTE pulses can be applied in synchronization with the sample rotation period. It is shown by simulation and expt. that the profiles of the offset dependence can be greatly improved by varying the amplitudes of the DANTE pulses, so that the envelope corresponds to that of a G3 Gaussian cascade. Alternatively, the DANTE pulses may be replaced by sandwiches composed of four hard pulses, adjusted so that the time-dependence of the nutation angles matches the envelope of a G3 Gaussian cascade. It is shown by simulations that in solids the profile are affected by homogeneous decay of magnetization, in analogy to the influence of transverse relaxation in liqs. Applications to the intramol. rearrangement (tautomerism) of polycryst. tropolone illustrate that dynamic processes in the solid state can be monitored with great accuracy. [on SciFinder (R)]

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https://infoscience.epfl.ch/entities/publication/4b6dcb74-689a-4d6a-84cf-cd5007085267

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Geoffrey Bodenhausen
1992
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4b6dcb74-689a-4d6a-84cf-cd5007085267

About this result

Related concepts (32)

Spin–spin relaxation

In physics, the spin–spin relaxation is the mechanism by which Mxy, the transverse component of the magnetization vector, exponentially decays towards its equilibrium value in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). It is characterized by the spin–spin relaxation time, known as T2, a time constant characterizing the signal decay. It is named in contrast to T1, the spin–lattice relaxation time.

Platonic solid

In geometry, a Platonic solid is a convex, regular polyhedron in three-dimensional Euclidean space. Being a regular polyhedron means that the faces are congruent (identical in shape and size) regular polygons (all angles congruent and all edges congruent), and the same number of faces meet at each vertex. There are only five such polyhedra: Geometers have studied the Platonic solids for thousands of years. They are named for the ancient Greek philosopher Plato who hypothesized in one of his dialogues, the Timaeus, that the classical elements were made of these regular solids.

Johnson solid

In geometry, a Johnson solid is a strictly convex polyhedron each face of which is a regular polygon. There is no requirement that each face must be the same polygon, or that the same polygons join around each vertex. An example of a Johnson solid is the square-based pyramid with equilateral sides (J_1); it has 1 square face and 4 triangular faces. Some authors require that the solid not be uniform (i.e., not Platonic solid, Archimedean solid, uniform prism, or uniform antiprism) before they refer to it as a "Johnson solid".

Related publications (17)

Shaped pulses for selective inversion of magnetization in solids spinning at the magic angle

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