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Influence of Magic Angle Spinning on Sample Temperature

✍ Scribed by Arnd-Rüdiger Grimmer; Axel Kretschmer; Victoria B. Cajipe

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
268 KB
Volume
35
Category
Article
ISSN
0749-1581

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✦ Synopsis

Magic angle spinning at sufficiently high rates dramatically changes the sample temperature. A method is described for calibrating a probe head for the thermal e †ects encountered during magnic angle spinning experiments. Using as a chemical shift thermometer, the overlapping e †ects of "externalÏ heating or cooling Sm 2 Sn 2 O 7 by the bearing gas and "internalÏ heating by friction on the actual sample temperature were studied. The empirical expression

describes the inÑuence of the bearing gas temperature (K) and the spinning rate (kHz) on the sample T b m r temperature (K).

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