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Thermometers for low temperature Magic Angle Spinning NMR

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Kemp, Thomas F., Balakrishnan, Geetha, Pike, Kevin J., Smith, Mark E. and Dupree, Ray. (2010) Thermometers for low temperature Magic Angle Spinning NMR. Journal of Magnetic Resonance, Vol.204 (No.1). pp. 169-172. ISSN 1090-7807

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Official URL: http://dx.doi.org/10.1016/j.jmr.2010.02.018

Abstract

The measurement of temperature in a Magic Angle Spinning NMR probe in the temperature range 85-300 K is discussed. It is shown that the shift of the Sn-119 resonance of Sm2Sn2O7 makes a good thermometer with shift being given by delta = 223 - 9.54 x 10(4)/T ppm and a potential precision of better than 0.5 K over the entire temperature range. The sensitivity is such (e.g. 4.2 ppm/K at 150 K) that small temperature gradients across the sample can readily be measured. Furthermore, since the spin-lattice relaxation time is very short, measurements can be made in similar to 1 s enabling relatively rapid temperature changes to be followed. Values for the chemical shift of Pb-207 in Pb(NO3)(2) down to similar to 85 K are also presented. Although the Pb-207 shift variation is approximately linear near room temperature (we find a slope 0.725 +/- 0.002 ppm/K over the range 293-153 K), it clearly deviates from linearity below similar to 130 K.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Administration > Vice Chancellor's Office Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Nuclear magnetic resonance spectroscopy -- Methodology, Temperature measuring instruments
Journal or Publication Title:	Journal of Magnetic Resonance
Publisher:	Academic Press
ISSN:	1090-7807
Date:	May 2010
Volume:	Vol.204
Number:	No.1
Number of Pages:	4
Page Range:	pp. 169-172
Identification Number:	10.1016/j.jmr.2010.02.018
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC)
Grant number:	EP/D045967 (EPSRC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/6074