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Influence of Magic Angle Spinning on Sample Temperature
Author(s) -
Grimmer ArndRüdiger,
Kretschmer Axel,
Cajipe Victoria B.
Publication year - 1997
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199702)35:2<86::aid-omr34>3.0.co;2-2
Subject(s) - spinning , chemistry , magic angle spinning , thermometer , analytical chemistry (journal) , magic angle , thermal , thermodynamics , polymer chemistry , chromatography , physics , stereochemistry , nuclear magnetic resonance spectroscopy
Magic angle spinning at sufficiently high rates dramatically changes the sample temperature. A method is described for calibrating a probe head for the thermal effects encountered during magnic angle spinning experiments. Using Sm 2 Sn 2 O 7 as a chemical shift thermometer, the overlapping effects of ‘external’ heating or cooling by the bearing gas and ‘internal’ heating by friction on the actual sample temperature were studied. The empirical expressionT s =0.12ν r 2 +(3.47‐0.013 T b )ν r +0.80 T b +58.6 describes the influence of the bearing gas temperature T b (K) and the spinning rate ν r (kHz) on the sample temperature T s (K). © 1997 by John Wiley & Sons, Ltd.