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Translational Dynamics and Magnetic ResonancePrinciples of Pulsed Gradient Spin Echo NMR$
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Paul T. Callaghan

Print publication date: 2011

Print ISBN-13: 9780199556984

Published to Oxford Scholarship Online: December 2013

DOI: 10.1093/acprof:oso/9780199556984.001.0001

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Tricks of the trade

Tricks of the trade

Chapter:
(p.524) 12 Tricks of the trade
Source:
Translational Dynamics and Magnetic Resonance
Author(s):

Paul T. Callaghan

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199556984.003.0012

This chapter gives pointers to the experimentalist on how to avoid artifact in the practical implementation of Pulsed Gradient Spin Echo NMR, and explores the role of the instrumental diffusion baseline. Topics covered include real-time diagnostics, sample vibration, convection, eddy currents, pulse mismatch, mains hum, power supply limitations, fringe field diffusometry, and pulse sequence compensation methods. The use of full q-space sampling is discussed. Finally, the need for operator vigilance is explained; the mere appearance of the echo signal as a Gaussian echo decay being no guarantee of a well-functioning diffusion experiment.

Keywords:   non-Gaussian decay, real-time diagnosis, vibration, convection, eddy currents, pulse mismatch, mains hum, power supply effects, fringe field diffusometry, pulse sequence compensation

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