Publication

Measurement of transverse relaxation in coupled spin systems by semi-selective refocusing: evidence for interference of CSA and dipolar relaxation

Geoffrey Bodenhausen
1990
Journal Articles

Abstract

A novel spin-echo expt. is proposed that uses semiselective Gaussian pulse cascades for refocusing in systems with homonuclear couplings. The expt. allows one to obtain evdience of differential T2 effects due to cross-correlation of proton chem. shift anisotropy and proton-proton dipolar interactions in a small arom. compd. at 9.4 T. The spin-echo expt. was applied to measure transverse relaxation rates for selected multiplets of the cyclic undecapeptide cyclosporin. Possible extensions to multiple-quantum spin echo-spectroscopy are indicated. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/08468bf3-20b1-407e-9528-127b5bf61f1e

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Geoffrey Bodenhausen
1990
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/08468bf3-20b1-407e-9528-127b5bf61f1e

About this result

Related concepts (30)

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.

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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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Two-dimensional nuclear magnetic resonance spectroscopy (2D NMR) is a set of nuclear magnetic resonance spectroscopy (NMR) methods which give data plotted in a space defined by two frequency axes rather than one. Types of 2D NMR include correlation spectroscopy (COSY), J-spectroscopy, exchange spectroscopy (EXSY), and nuclear Overhauser effect spectroscopy (NOESY). Two-dimensional NMR spectra provide more information about a molecule than one-dimensional NMR spectra and are especially useful in determining the structure of a molecule, particularly for molecules that are too complicated to work with using one-dimensional NMR.

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Measurement of transverse relaxation in coupled spin systems by semi-selective refocusing: evidence for interference of CSA and dipolar relaxation

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