Rationalising Heteronuclear Decoupling in Refocussing Applications of Solid-State NMR Spectroscopy.

ABSTRACT: Factors affecting the performance of ¹ H heteronuclear decoupling sequences for magic-angle spinning (MAS) NMR spectroscopy of organic solids are explored, as observed by time constants for the decay of nuclear magnetisation under a spin-echo (T2' ). By using a common protocol over a wide range of experimental conditions, including very high magnetic fields and very high radio-frequency (RF) nutation rates, decoupling performance is observed to degrade consistently with increasing magnetic field. Inhomogeneity of the RF field is found to have a significant impact on T2' values, with differences of about 20 % observed between probes with different coil geometries. Increasing RF nutation rates dramatically improve robustness with respect to RF offset, but the performance of phase-

SUBMITTER: Frantsuzov I 

PROVIDER: S-EPMC5396389 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature