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RECORD NUMBER: 9 OF 9

OLS Field Name OLS Field Data
Main Title Sensitive NMR Thermometer for Multinuclei FT NMR.
Author Levy, George C. ; Bailey, J. Terry ; Wright, David A. ;
CORP Author Florida State Univ., Tallahassee. Dept. of Chemistry.;Health Effects Research Lab., Research Triangle Park, NC.
Year Published 1979
Report Number EPA-R-804916; EPA-600/J-80-375;
Stock Number PB82-154865
Additional Subjects Nuclear magnetic resonance ; Temperature measuring instruments ; Monitoring ; Performance evaluation ; Reprints ; Fourier transform spectroscopy
Holdings
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Status
NTIS  PB82-154865 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 6p
Abstract A pernicious problem in multinuclei FT NMR is accurate measurement of sample temperature. This arises from several factors including widespread use of high-power decoupling, large sample tubes (with potentially large temperature gradients across the sample volume), and lack of suitable compounds having temperature-dependent shielding characteristics. The use of proton shieldings is generally precluded as a result of 1H decoupling. Use of thermocouples or thermistors to monitor sample temperature involves either measurement of flow gas temperature (which may not be the same as the sample temperature) or insertion of the device into the sample. Although the latter practice may give an accurate temperature reading at any one point in the sample, it is not sensitive to gradients in temperature. Stopping an experiment and placing one of these devices in a sample necessarily perturbs the temperature of the sample. In addition, there is evidence of thermocouple thermometry errors resulting from large magnetic fields.
Supplementary Notes Pub. in Jnl. of Magnetic Resonance 37, p353-356 1980.
NTIS Title Notes Journal article.
Title Annotations Reprint: A Sensitive NMR Thermometer for Multinuclei FT NMR.
PUB Date Free Form 6 Aug 79
Category Codes 14B; 99A
NTIS Prices PC A02/MF A01
Primary Description 600/11
Document Type NT
Cataloging Source NTIS/MT
Control Number 323810587
Origin NTIS
Type CAT