An earth’s field nuclear magnetic resonance apparatus suitable for pulsed gradient spin echo measurements of self-diffusion under Antarctic conditions

We describe an earth’s field nuclear magnetic resonance apparatus which can be used to carry out pulsed gradient spin echo (PGSE) diffusion measurements. The instrument is portable and incorporates automated process control, allowing direct measurement of the Larmor precession. The use of a common c...

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Bibliographic Details
Published in:Review of Scientific Instruments
Main Authors: Callaghan, P. T., Eccles, C. D., Seymour, J. D.
Format: Article in Journal/Newspaper
Language:English
Published: AIP Publishing 1997
Subjects:
Antarctic
McMurdo Sound
New Zealand
The Antarctic
Antarc*
Sea ice
Online Access:http://dx.doi.org/10.1063/1.1148340
https://pubs.aip.org/aip/rsi/article-pdf/68/11/4263/19277451/4263_1_online.pdf
Description
Summary:We describe an earth’s field nuclear magnetic resonance apparatus which can be used to carry out pulsed gradient spin echo (PGSE) diffusion measurements. The instrument is portable and incorporates automated process control, allowing direct measurement of the Larmor precession. The use of a common clock for pulse sequencing, excitation pulse synthesis, and detection, results in a phase stability sufficient for accurate signal averaging. The analysis of PGSE data under the conditions of a weak detection field is discussed and measurements of diffusion are presented under both New Zealand and Antarctic conditions. The Antarctic results include an example of restricted diffusion of brine water in McMurdo Sound sea ice.

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