title: Solid state NMR at high magic angle spinning frequencies: dipolar chemical shift correlation with adiabatic inversion pulse based RF pulse schemes.
abstract: 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.
authors.affiliation: Molecular Biophysics/NMR spectroscopy group, Leibniz Institute for Age Research, Fritz Lipmann Institute, D-07745, Jena, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Herbst
authors.forename: Kerstin
authors.initials: K
authors.lastname: Riedel
authors.forename: Jörg
authors.initials: J
authors.lastname: Leppert
authors.forename: Oliver
authors.initials: O
authors.lastname: Ohlenschläger
authors.forename: Matthias
authors.initials: M
authors.lastname: Görlach
authors.forename: Ramadurai
authors.initials: R
authors.lastname: Ramachandran
mesh_terms: D002247:Carbon Isotopes; D008956:Models, Chemical; D009587:Nitrogen Isotopes; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*
chemical_list: D002247:Carbon Isotopes; D009587:Nitrogen Isotopes