An alternative type of single-solenoid radio frequency (rf) probe for diamond anvil cell (DAC) NMR is described. The rf probe provides a higher signal-to-noise ratio (S/N) than previous designs for DAC-NMR of liquid samples. It induces a practically homogeneous rf field that enables straightforward measurements even at a marginal S/N. It can be installed and removed without changing the sample pressure, which enhances the efficiency of experimentation beyond that attainable with previous designs. This rf probe will facilitate the application of NMR to liquids at extreme pressures.
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