Publication

Self-refocusing effect of 270 Deg Gaussian pulses: applications to selective two-dimensional exchange spectroscopy

Geoffrey Bodenhausen
1989
Journal Articles

Abstract

A soln. is presented to the problem of phase dispersion in the resultant magnetization for pulses used for high-resoln. NMR work by demonstrating how a Gaussian pulse having an on-resonance flip angle of 270 Deg has much improved phase properties over the conventional 90 Deg Gaussian pulse. Since the whole pulse is soft, the coupling partners of a multiplet are not affected, and the evolution of the magnetization due to couplings will be refocused in exactly the same way as if it were due to chem. shifts. An illustrative spectrum of a mixt. of cis- and trans-2-phenylcyclopropanecarboxylic acid Me ester obtained with a hard 90 Deg pulse is presented. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/a4bfa964-929b-42e9-bfe8-0946440833b2

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Geoffrey Bodenhausen
1989
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a4bfa964-929b-42e9-bfe8-0946440833b2

About this result

Related concepts (32)

Nuclear magnetic resonance

Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near field) and respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus. This process occurs near resonance, when the oscillation frequency matches the intrinsic frequency of the nuclei, which depends on the strength of the static magnetic field, the chemical environment, and the magnetic properties of the isotope involved; in practical applications with static magnetic fields up to ca.

Two-dimensional nuclear magnetic resonance spectroscopy

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.

J-coupling

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.

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Self-refocusing effect of 270 Deg Gaussian pulses: applications to selective two-dimensional exchange spectroscopy

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