An improved broadband decoupling sequence for liquid crystals and solids.
Recently we developed an efficient broadband decoupling sequence called SPARC-16 for liquid crystals ¿J. Magn. Reson. 130, 317 (1998). The sequence is based upon a 16-step phase cycling of the 2-step TPPM decoupling method for solids ¿J. Chem. Phys. 103, 6951 (1995). Since then, we have found that a stepwise variation of the phase angle in the TPPM sequence offers even better results. The application of this new method to a liquid crystalline compound, 4-n-pentyl-4'-cyanobiphenyl, and a solid, L-tyrosine hydrochloride, is reported. The reason for the improvement is explained by an analysis of the problem in the rotating frame.
Fung
B M
BM
Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019-0370, USA.
Khitrin
A K
AK
Ermolaev
K
K
D003460:Crystallization; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*