Publication

Pulse cascades: a simple description of the flip angle dependence of NMR spectra

Geoffrey Bodenhausen
1979
Journal Articles

Abstract

A simple phys. picture which correctly predicts the flip angle effect in Fourier transform spectroscopy discussed by R. R. Ernst et al. (1974) is presented. The approach is based on populations alone and does not require knowledge of the d. matrix formalism. Nonselective pulses are represented by a cascade of consecutive pulses which affect only certain sets of transition at a time. The relative timing of the pulses within the cascade is unimportant provided the intervals are all short with respect to nuclear precession rates and relaxation. [on SciFinder (R)]

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https://infoscience.epfl.ch/entities/publication/29221d8a-9e77-4291-9e64-318b17925b79

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Geoffrey Bodenhausen
1979
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/29221d8a-9e77-4291-9e64-318b17925b79

About this result

Related concepts (27)

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.

Nuclear magnetic resonance spectroscopy

Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy or magnetic resonance spectroscopy (MRS), is a spectroscopic technique to observe local magnetic fields around atomic nuclei. This spectroscopy is based on the measurement of absorption of electromagnetic radiations in the radio frequency region from roughly 4 to 900 MHz. Absorption of radio waves in the presence of magnetic field is accompanied by a special type of nuclear transition, and for this reason, such type of spectroscopy is known as Nuclear Magnetic Resonance Spectroscopy.

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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Pulse cascades: a simple description of the flip angle dependence of NMR spectra

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