Solid state NMR at high magic angle spinning frequencies: dipolar chemical shift correlation with adiabatic inversion pulse based RF pulse schemes.
The efficacy of hetero- and homonuclear dipolar recoupling employing tanh/tan adiabatic inversion pulse based RF pulse schemes has been examined at high magic angle spinning (MAS) frequencies via numerical simulations and experimental measurements. An approach for minimising the recoupling RF power level is presented, taking into consideration the spinning speed, the range of resonance offsets and H(1) inhomogeneities and the available RF field strength. This involves the tailoring of the frequency and amplitude modulation profiles of the inversion pulses. The applicability of tanh/tan pulse based dipolar recoupling schemes to spinning speed regimes where the performance with conventional rectangular pulses may not be satisfactory is demonstrated.
Herbst
Christian
C
Molecular Biophysics/NMR spectroscopy group, Leibniz Institute for Age Research, Fritz Lipmann Institute, D-07745, Jena, Germany.
Riedel
Kerstin
K
Leppert
Jörg
J
Ohlenschläger
Oliver
O
Görlach
Matthias
M
Ramachandran
Ramadurai
R
D002247:Carbon Isotopes; D008956:Models, Chemical; D009587:Nitrogen Isotopes; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*
D002247:Carbon Isotopes; D009587:Nitrogen Isotopes