A Combination of Slow and Fast RF Field Modulation for Improved Cross Polarization in Solid-State MAS NMR

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A method for efficient Hartmann-Hahn cross polarization under rapid magic-angle sample spinning is presented. It combines rotor-synchronized amplitude modulation of one of the two spin-lock radio-frequency fields for dipolar recoupling, with a slow adiabatic amplitude variation to enhance the net polarization transfer. The proposed scheme, called AMAP-CP, allows for cross polarization on the original Hartmann-Hahn matching condition omega 1 I = omega 1 S . The polarization transfer is insensitive to chemical-shift offsets, rotation frequency, and inhomogeneity of the radiofrequency field.

Document Type: Research Article

Affiliations: 1: Laboratorium fur Physikalische Chemie, Eidgenossische Technische Hochschule, ETH-Zentrum, Zurich, 8092, Switzerland 2: NSR-Center for Molecular Structure, Design and Synthesis, Laboratory of Physical Chemistry, University of Nijmegen, Toernooiveld, Nijmegen, 6525 ED, The Netherlands

Publication date: April 1, 1997

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