Fig. 5.

Solution NMR. a, b NMR spectra of 20% by weight CsF solution in glycerol at 47.2 and 40.5 mT. c NMR spectrum of pure glycerol. All spectra were measured with an XY8-10 correlation spectroscopy pulse sequence tuned to the ¹⁹F precession frequency. Each spectrum was fit to a single Lorentzian function with central frequency set to the anticipated ¹⁹F Larmor frequency. The linewidth was fixed to that of the ¹H linewidth in glycerol obtained under similar conditions. The only free fit parameters were peak amplitude and offset. We assume that each spectrum contains at most one NMR line (from ¹⁹F) and other fluctuations are due to noise. Error bars represent standard deviation of off-resonant points