Magic angle spinning NMR below 6?K with a computational fluid dynamics analysis of fluid flow and temperature gradients

摘要

Graphical abstractDisplay OmittedHighlights?Magic angle spinning (MAS) with a sample temperature <6?K.?MAS <6?K at a rotational frequency >8?kHz.?Finite element analysis to model fluid flow and temperature gradients in cryogenic MAS.?Finite element analysis provides insight into technology design and sample temperature measurement.AbstractWe report magic angle spinning (MAS) up to 8.5?kHz with a sample temperature below 6?K using liquid helium as a variable temperature fluid. Cross polarization13C NMR spectra exhibit exquisite sensitivity with a single transient. Remarkably,