Magnetic flux tailoring through Lenz lenses for ultrasmall samples: A new pathway to high-pressure nuclear magnetic resonance

Abstract

A new approach to perform high-pressure NMR at unprecedented pressures is introduced.

Nuclear Magnetic Resonance Spectroscopy as a Dynamical Structural Probe of Hydrogen under High Pressure

“…Experiments are challenging due to a variety of factors, including weak signals, low resonator sensitivities, and poor access to the samples in the anvil cells, which have traditionally limited high pressure NMR spectroscopy experiments to a maximum of a few tens of GPa [15]. This situation has recently changed with the ground-breaking developments of Meier and co-workers, who exploiting magnetic flux tailoring Lenz lenses to amplify the magnetic field at the sample have measured hydrogen NMR spectra of paraffin up to 72 GPa [16] and of FeH up to 200 GPa [17]. The state-of-the-art of high pressure NMR spectroscopy has recently been reviewed in Refs.…”

Journey to the centre of the Earth: Jules Vernes’ dream in the laboratory from an NMR perspective

“…Black arrows denote the directions of the high-frequency current. Taken from [56] proved not only to be exceedingly stable under compression, but also to yield much higher sensitivities compared to all other methods so far. Figure 11a shows one of the first test scans using paraffin oil as a sample.…”

“…The dotted lines represent the effective observable sample volume. Taken from [56] Figure 13: Upper photo: completely prepared DSLL-resonator for a DAC equipped with two 250 µm culeted anvils. Lower photo: mounted pressure cell on a home-built NMR probe tial sample volume; but on the other hand, the sensitivity of the DSLL-resonator will benefit from the increased proximity due to smaller inner diameters of the second stage LL, as well as a reduced distance between both pairs of LL on the advancing diamonds.…”

Improving resolution of solid state NMR in dense molecular hydrogen

“…Therefore, an upper limit of a total amount of 3 nmol of hydrogen loaded in the sample cavities could be estimated, corresponding to 1.7 · 10 15 H 2 molecules. Considering a normalised time domain signal-to-noise ratio of 8.8 and a limiting bandwidth of 1 MHz, a limit-ofdetection [21] of 2·10 11 spins/Hz 1/2 has been found. Performing standard single pulse experiments, an intense and rapidly decaying 1 H signal was detected, at the respective Larmor frequency of protons at 1063 mT, figure 3a.…”