Paul T. Callaghan
- Published in print:
- 2011
- Published Online:
- December 2013
- ISBN:
- 9780199556984
- eISBN:
- 9780191774928
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199556984.003.0012
- Subject:
- Physics, Condensed Matter Physics / Materials, Nuclear and Plasma Physics
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 ...
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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.Less
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.
