Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Thermometers for low temperature Magic Angle Spinning NMR
AU - Kemp, Thomas F.
AU - Balakrishnan, G.
AU - Pike, Kevin J.
AU - Smith, Mark E.
AU - Dupree, Ray
PY - 2010/5/1
Y1 - 2010/5/1
N2 - 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.
AB - 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.
KW - Solid-state NMR
KW - Magic Angle Spinning
KW - Low temperature
KW - Thermometers
U2 - 10.1016/j.jmr.2010.02.018
DO - 10.1016/j.jmr.2010.02.018
M3 - Journal article
VL - 204
SP - 169
EP - 172
JO - Journal of Magnetic Resonance
JF - Journal of Magnetic Resonance
SN - 1096-0856
IS - 1
ER -