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. Author manuscript; available in PMC: 2012 Apr 1.
Published in final edited form as: J Magn Reson. 2011 Jan 13;209(2):167–173. doi: 10.1016/j.jmr.2011.01.005

Figure 5. Evaluation of the sample heating in different tubes.

Figure 5

(a) Pulse sequence employed to evaluate the heating of a 99 % D2O water sample containing 1 mM DSS and 300 mM NaCl (pH 4.8). The experiments were performed using a DRX600 NMR spectrometer equipped with a TCI cryogenic probe regulated at 25 °C. Pre-saturation was carried out by continuous wave irradiation at a transmitter output of 0.4 W. Following the application of 32 dummy pulses, the 1H 1D spectrum was acquired in 2 transients. The increase of the sample temperature was measured from the chemical shift difference between the HDO peak and the methyl peaks of DSS: (b) Results for the slot tube (●), 3 mm o.d. microtube (▲), 4 mm o.d. microtube (■), 5 mm o.d. microtube (◆).