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Temperature Calibration under Ultrafast MAS Conditions

✍ Scribed by Benedikt Langer; Ingo Schnell; Hans Wolfgang Spiess; Arnd-Rüdiger Grimmer

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
71 KB
Volume
138
Category
Article
ISSN
1090-7807

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✦ Synopsis

For conventional fast magic-angle spinning (MAS) frequencies (<15 kHz), there is a known heating of the sample due to the friction between the rotor and the bearing gas. At the recently achievable ultrafast MAS frequencies of up to 35 kHz, a more dramatic heating effect is expected. Using the 119 Sn NMR signal of the chemical shift thermometer Sm 2 Sn 2 O 7 , this frictional heating effect is quantified, and a calibration of the sample temperature under ultrafast MAS conditions is described. An empirical expression is given which allows the determination of the sample temperature as a function of the bearing gas temperature and the spinning frequency.

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Simple technique for temperature calibra
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