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Extension and improvement of the methanol‐ d 4 NMR thermometer calibration
Author(s) -
Karschin Niels,
Krenek Stephan,
Heyer Dieter,
Griesinger Christian
Publication year - 2022
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/mrc.5216
Subject(s) - thermometer , chemistry , calibration , methanol , analytical chemistry (journal) , spectrometer , international temperature scale of 1990 , calibration curve , atmospheric temperature range , sensitivity (control systems) , range (aeronautics) , detection limit , thermodynamics , chromatography , optics , organic chemistry , physics , materials science , quantum mechanics , electronic engineering , composite material , engineering
NMR thermometers are a convenient way to determine the temperature inside the sample of an NMR spectrometer. They rely on signals with strongly temperature‐dependent chemical shifts, often of OH groups; 99.8% perdeuterated methanol is an established example which is particularly well suited for modern, high‐sensitivity spectrometers, but it is so far calibrated only in the range of 282 to 330 K. In this work, we extend this calibration to the entire liquid range of methanol, 175 to 338 K. Additionally, we use a temperature sensor calibrated traceably to the International Temperature Scale (ITS‐90) and accounted for the magnetic field effect on the sensor, yielding a more accurate calibration curve with an uncertainty (2 σ ) varying between 25 and 190 mK.