Publication

Phase shifts induced by transient Bloch-Siegert effects in NMR

Geoffrey Bodenhausen
1990
Journal Articles

Abstract

It is shown by simulation and expt. that selective pulses designed to invert or excite magnetization over a limited frequency window induce significant phase shifts over a bandwidth much larger than the chosen window. These phase shifts affect all expts. where selective pulses are used after exciting transverse magnetization or generally p-quantum coherence. The phase shifts may be compensated by modifying the phases of the rf pulses during the expts. or in some cases by suitable data transformations. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/7f7145cf-d443-49bb-9494-02af72fafe9e

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Geoffrey Bodenhausen
1990
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/7f7145cf-d443-49bb-9494-02af72fafe9e

About this result

Related concepts (18)

Phase response curve

A phase response curve (PRC) illustrates the transient change (phase response) in the cycle period of an oscillation induced by a perturbation as a function of the phase at which it is received. PRCs are used in various fields; examples of biological oscillations are the heartbeat, circadian rhythms, and the regular, repetitive firing observed in some neurons in the absence of noise. In humans and animals, there is a regulatory system that governs the phase relationship of an organism's internal circadian clock to a regular periodicity in the external environment (usually governed by the solar day).

Phase-contrast microscopy

NOTOC Phase-contrast microscopy (PCM) is an optical microscopy technique that converts phase shifts in light passing through a transparent specimen to brightness changes in the image. Phase shifts themselves are invisible, but become visible when shown as brightness variations. When light waves travel through a medium other than a vacuum, interaction with the medium causes the wave amplitude and phase to change in a manner dependent on properties of the medium.

Quantitative phase-contrast microscopy

FORCETOC Quantitative phase contrast microscopy or quantitative phase imaging are the collective names for a group of microscopy methods that quantify the phase shift that occurs when light waves pass through a more optically dense object. Translucent objects, like a living human cell, absorb and scatter small amounts of light. This makes translucent objects much easier to observe in ordinary light microscopes. Such objects do, however, induce a phase shift that can be observed using a phase contrast microscope.