Investigating NMR (nuclear magnetic resonance) phenomena at variable magnetic fields is useful and insightful for hyperpolarization and molecular dynamics in particular. To benefit from high-resolution at high magnetic fields, field-dependent investigations can be performed using a high-field NMR spectrometer, with a sample shuttle apparatus for field cycling. Here, we introduce a new design of a sample shuttle which is fast, reliable, and narrow. We show a series of applications involving small molecules and a protein in solution.

Strong signals in nuclear magnetic resonance are perturbed by their feedback interaction with the radio frequency circuit, a phenomenon known as radiation damping. This effect is usually weak and only influences the signals that are at its source. In this work, it is shown that, under certain circumstances, radiation damping can have far-reaching consequences.