Publication

NMR cross polarization by adiabatic passage through the Hartmann-Hahn condition (APHH)

Geoffrey Bodenhausen
1994
Journal Articles

Abstract

The heteronuclear cross-polarization efficiency in the rotating frame can be improved by sweeping the radiofrequency amplitude adiabatically through the Hartmann-Hahn condition. The enhancement is particularly significant for strongly coupled IS spin systems with weak dipolar coupling to extraneous spins. A good approxn. to an adiabatic transfer is obtained with a tangential time dependence of the radiofrequency field amplitude whereby transient oscillations are efficiently suppressed. [on SciFinder (R)]

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https://infoscience.epfl.ch/entities/publication/9f3b3a58-4ebd-4435-aa48-a5dcd7fc9b25

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Geoffrey Bodenhausen
1994
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/9f3b3a58-4ebd-4435-aa48-a5dcd7fc9b25

About this result

Related concepts (32)

Solid-state nuclear magnetic resonance

Solid-state NMR (ssNMR) spectroscopy is a technique for characterizing atomic level structure in solid materials e.g. powders, single crystals and amorphous samples and tissues using nuclear magnetic resonance (NMR) spectroscopy. The anisotropic part of many spin interactions are present in solid-state NMR, unlike in solution-state NMR where rapid tumbling motion averages out many of the spin interactions.

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In nuclear chemistry and nuclear physics, J-couplings (also called spin-spin coupling or indirect dipole–dipole coupling) are mediated through chemical bonds connecting two spins. It is an indirect interaction between two nuclear spins that arises from hyperfine interactions between the nuclei and local electrons. In NMR spectroscopy, J-coupling contains information about relative bond distances and angles. Most importantly, J-coupling provides information on the connectivity of chemical bonds.

Nuclear Overhauser effect

The nuclear Overhauser effect (NOE) is the transfer of nuclear spin polarization from one population of spin-active nuclei (e.g. 1H, 13C, 15N etc.) to another via cross-relaxation. A phenomenological definition of the NOE in nuclear magnetic resonance spectroscopy (NMR) is the change in the integrated intensity (positive or negative) of one NMR resonance that occurs when another is saturated by irradiation with an RF field. The change in resonance intensity of a nucleus is a consequence of the nucleus being close in space to those directly affected by the RF perturbation.

Related publications (9)

NMR cross polarization by adiabatic passage through the Hartmann-Hahn condition (APHH)

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