We describe the construction of an NMR probe to acquire data up to pressures of 2.5 GPa on solutions.  The probe is housed in a 1 Tesla permanent magnet equipped with pulsed field gradients that are used for shimming.  Diffusion data were collected on <sup>1</sup>H for various electrolyte solutions of LaCl<sub>3 </sub>and CsCl to demonstrate the probe efficacy. Orientation of the NMR solenoid was changed from a horizontal position to coaxial with the probe housing, which allows for better signal-to-noise ratios on spectral data.  To compensate for inhomogeneity in the RF pulse field, a unique spin-echo pulse sequence was designed to select from among spin echoes in the NMR spectra.  High-pressure 2D spectra were then collected using a modified spin-echo correlation-spectroscopy (SECSY) pulse sequence on pure ethanol and pure ethylene glycol at gigapascal pressures.

NMR Correlation spectroscopy of liquids at geochemical pressures

253rd National Meeting (2017)

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