Rotor synchronization of radiofrequency and gradient pulses in high-resolution magic angle spinning NMR.
We have investigated the extent to which rotor synchronization of radiofrequency pulses leads to spectral improvement in high-resolution magic angle spinning NMR experiments. Several pulse sequences were tested, and the effect was found to be maximal in homonuclear TOCSY spectra. The physicochemical nature of the sample plays a role in the phenomenon, as rotor synchronization allows the refocusing of residual anisotropic interactions. However, even in a liquid sample the effects were visible. Radial inhomogeneities of the radiofrequency field were identified as an important source of the problem.
Wieruszeski
J M
JM
UMR 8525 CNRS, Institut de Biologie de Lille, Institut Pasteur de Lille, Université de Lille II, 1 rue du Professeur Calmette, 59021 Lille Cedex, France.
Montagne
G
G
Chessari
G
G
Rousselot-Pailley
P
P
Lippens
G
G
D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D013997:Time Factors